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		<title>PHP RSS Feed Generator Class</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/17h2TojQGSc/</link>
		<comments>http://joaopedropereira.com/blog/2010/07/28/php-rss-feed-generator-class/#comments</comments>
		<pubDate>Tue, 27 Jul 2010 23:06:28 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[PHP]]></category>
		<category><![CDATA[Projectos]]></category>
		<category><![CDATA[Webdevelopment]]></category>
		<category><![CDATA[class]]></category>
		<category><![CDATA[feed]]></category>
		<category><![CDATA[php]]></category>
		<category><![CDATA[rss]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=858</guid>
		<description><![CDATA[English Version &#124; Versão Portuguesa It&#8217;s been a while since I&#8217;ve planned on developing a new platform for my work as Web Developer, and next to all Web Developers, and I started to develop some modules and this RSS Generator Class born to fulfill my needs. Supported versions: RSS 2.0 Download: Download it Features: Generates [...]]]></description>
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<h2 style="text-align: center;"><a title="English Version" href="#english">English Version</a> | <a href="#portugues">Versão Portuguesa</a></h2>
<p style="text-align: center;"><a class="button" href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip"><br />
</a></p>
<hr />
<span id="english"> </span></p>
<p>It&#8217;s been a while since I&#8217;ve planned on developing a new platform for my work as Web Developer, and next to all Web Developers, and I started to develop some modules and this RSS Generator Class born to fulfill my needs.</p>
<p><span style="text-decoration: underline;">Supported versions:</span><br />
RSS 2.0</p>
<p><span style="text-decoration: underline;">Download:</span><br />
<a title="Download RSS Feed Generator Class" href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip">Download it</a></p>
<p><span style="text-decoration: underline;">Features:</span><br />
Generates RSS 2.0 feeds<br />
All feeds are validated by <a title="Feed Validator" href="http://feedvalidator.org/" target="_blank">feed validator</a><br />
Supports all feed elements<br />
Simple &amp; easy to define channel proprieties<br />
Simple &amp; easy to define item elements<br />
Enables usage of sub-tags and attributes</p>
<p><span style="text-decoration: underline;">Example </span></p>
<p>It&#8217;s a minimum &#8220;how to&#8221; example needed to understand how to use this class. It&#8217;s part of the download package.</p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;"><span style="color: #b1b100;">include</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">&quot;feed.php&quot;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create a new Feed</span>
	<span style="color: #000088;">$feed</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Feed<span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Setting the channel elements</span>
	<span style="color: #666666; font-style: italic;">//Helper -&gt; http://www.rssboard.org/rss-specification</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedTitle</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Demo - RSS Generator Class'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedLink</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://joaopedropereira.com/blog/rss'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedDesc</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'This is demo of generating a RSS feed. ONLY RSS Version 2.0 Supported'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedImage</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Oh, my photo...'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://joaopedropereira.com/projects/rss_gen'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://s3.amazonaws.com/twitter_production/profile_images/63969619/imagemresized.jpg'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Is possible to use setChannelElm() function for setting other optional channel elements</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setChannelElm</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'language'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'en-us'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create a new Item</span>
	<span style="color: #000088;">$item1</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Item<span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Setting the Item elements</span>
	<span style="color: #666666; font-style: italic;">//Helper -&gt; http://www.rssboard.org/rss-specification</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemTitle</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Item nº 1'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemLink</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://joaopedropereira.com'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDate</span><span style="color: #009900;">&#40;</span> <span style="color: #990000;">time</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDesc</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Bla, bla, bla, item nº 1.'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemEnclosure</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://www.beardodisco.com/beatelectric/music/Loverboy12Mix.mp3'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'17121349'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'audio/mpeg'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemAuthor</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'contacto@joaopedropereira.com (João Pedro Pereira)'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #666666; font-style: italic;">//As in Channel is possible to use setItemElm() function for setting other optional item elements</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create another Item</span>
	<span style="color: #000088;">$item2</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Item<span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Item nº 2'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://twitter.com/joaoppereira'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'Bla, bla, bla, twitter of the owner of the blog of a webdeveloper'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #000088;">$item2</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDate</span><span style="color: #009900;">&#40;</span> <span style="color: #990000;">time</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item2</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemAuthor</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'contacto@joaopedropereira.com (João Pedro Pereira)'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Adding both created items</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">addItem</span><span style="color: #009900;">&#40;</span> <span style="color: #000088;">$item1</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">addItem</span><span style="color: #009900;">&#40;</span> <span style="color: #000088;">$item2</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Now we're ready to generate the Feed, Awesome!</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">genFeed</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

<p style="text-align: center;"><a class="button" href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip">Download</a> | <a class="button" href="http://joaopedropereira.com/projects/rss_gen/">Demo</a></p>
<p><img src="http://joaopedropereira.com/blog/wp-content/uploads/2010/07/Demo-RSS-Generator-Class_1280270120429-w640-h480.png" alt="" title="Demo - RSS Feed Generator Class" width="640" height="311" class="aligncenter size-full wp-image-886" /></p>
<p style="text-align: center;"><a class="button" href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip">Download</a> | <a class="button" href="http://joaopedropereira.com/projects/rss_gen/">Demo</a></p>
<hr />
<p><span id="portugues"> </span></p>
<p>Há já algum tempo que pretendo desenvolver uma nova plataforma para o meu trabalho como Web Developer, e numa fase posterior abrir como serviço para todos os Web Developers, e por isso comecei a desenvolver alguns módulos para essa plataforma, trabalho que deu, entre outros, no módulo de RSS Feed&#8217;s surgindo assim a RSS Generator Class para satisfazer as necessidades.</p>
<p><span style="text-decoration: underline;">Versões Suportadas:</span><br />
RSS 2.0</p>
<p><span style="text-decoration: underline;">Download:</span><br />
<a title="Download RSS Feed Generator Class" href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip">Download it</a></p>
<p><span style="text-decoration: underline;">Funcionalidades:</span><br />
Gera RSS Feeds versão 2.0<br />
As feeds são válidas conforme o <a title="Feed Validator" href="http://feedvalidator.org/" target="_blank">feed validator</a><br />
Suporta todos os elementos quer dos channel&#8217;s quer dos item&#8217;s<br />
É simples definir as propriedades do channel<br />
É simples definir as propriedades dos items</p>
<p>É possível utilizar sub-tags e atributos</p>
<p><span style="text-decoration: underline;">Exemplo</span></p>
<p>Um pequeno exemplo que mostra como se pode fazer uso desta classe. Faz parte do pacote disponível para download.</p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;"><span style="color: #b1b100;">include</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">&quot;feed.php&quot;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create a new Feed</span>
	<span style="color: #000088;">$feed</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Feed<span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Setting the channel elements</span>
	<span style="color: #666666; font-style: italic;">//Helper -&gt; http://www.rssboard.org/rss-specification</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedTitle</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Demo - RSS Generator Class'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedLink</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://joaopedropereira.com/blog/rss'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedDesc</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'This is demo of generating a RSS feed. ONLY RSS Version 2.0 Supported'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setFeedImage</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Oh, my photo...'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://joaopedropereira.com/projects/rss_gen'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://s3.amazonaws.com/twitter_production/profile_images/63969619/imagemresized.jpg'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Is possible to use setChannelElm() function for setting other optional channel elements</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setChannelElm</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'language'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'en-us'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create a new Item</span>
	<span style="color: #000088;">$item1</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Item<span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Setting the Item elements</span>
	<span style="color: #666666; font-style: italic;">//Helper -&gt; http://www.rssboard.org/rss-specification</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemTitle</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Item nº 1'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemLink</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://joaopedropereira.com'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDate</span><span style="color: #009900;">&#40;</span> <span style="color: #990000;">time</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDesc</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Bla, bla, bla, item nº 1.'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemEnclosure</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'http://www.beardodisco.com/beatelectric/music/Loverboy12Mix.mp3'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'17121349'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'audio/mpeg'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item1</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemAuthor</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'contacto@joaopedropereira.com (João Pedro Pereira)'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #666666; font-style: italic;">//As in Channel is possible to use setItemElm() function for setting other optional item elements</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Create another Item</span>
	<span style="color: #000088;">$item2</span> <span style="color: #339933;">=</span> <span style="color: #000000; font-weight: bold;">new</span> Item<span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'Item nº 2'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'http://twitter.com/joaoppereira'</span><span style="color: #339933;">,</span> <span style="color: #0000ff;">'Bla, bla, bla, twitter of the owner of the blog of a webdeveloper'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #000088;">$item2</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemDate</span><span style="color: #009900;">&#40;</span> <span style="color: #990000;">time</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$item2</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">setItemAuthor</span><span style="color: #009900;">&#40;</span> <span style="color: #0000ff;">'contacto@joaopedropereira.com (João Pedro Pereira)'</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Adding both created items</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">addItem</span><span style="color: #009900;">&#40;</span> <span style="color: #000088;">$item1</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">addItem</span><span style="color: #009900;">&#40;</span> <span style="color: #000088;">$item2</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
	<span style="color: #666666; font-style: italic;">//Now we're ready to generate the Feed, Awesome!</span>
	<span style="color: #000088;">$feed</span><span style="color: #339933;">-&gt;</span><span style="color: #004000;">genFeed</span><span style="color: #009900;">&#40;</span> <span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

<p style="text-align: center;"><a href="http://joaopedropereira.com/projects/rss_gen/rss_gen.zip">Download</a> | <a href="http://joaopedropereira.com/projects/rss_gen/">Demo</a></p>


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</div><img src="http://feeds.feedburner.com/~r/joaopedropereira/~4/17h2TojQGSc" height="1" width="1"/>]]></content:encoded>
			<wfw:commentRss>http://joaopedropereira.com/blog/2010/07/28/php-rss-feed-generator-class/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
<enclosure url="http://www.beardodisco.com/beatelectric/music/Loverboy12Mix.mp3" length="17121349" type="audio/mpeg" />
		<feedburner:origLink>http://joaopedropereira.com/blog/2010/07/28/php-rss-feed-generator-class/</feedburner:origLink></item>
		<item>
		<title>PHP Simple Events System Overview</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/jdbwyaQmGqI/</link>
		<comments>http://joaopedropereira.com/blog/2010/07/21/php-simple-events-system-overview/#comments</comments>
		<pubDate>Wed, 21 Jul 2010 18:30:41 +0000</pubDate>
		<dc:creator>scorch</dc:creator>
				<category><![CDATA[PHP]]></category>
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		<category><![CDATA[AJAX]]></category>
		<category><![CDATA[eventos]]></category>
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		<description><![CDATA[O PHP-SimpleEventsSystem é uma simples classe em PHP que permite a qualquer programador criar uma aplicação orientada a eventos em PHP. Sendo assim, esta classe possibilita a criação mais facilmente de aplicações web com possibilidade de adicionar plugins, sem que estes tenham de mexer com o código interno da aplicação, permite que uma framework use [...]]]></description>
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<p>O PHP-SimpleEventsSystem é uma simples classe em PHP que permite a qualquer programador criar uma aplicação orientada a eventos em PHP. Sendo assim, esta classe possibilita a criação mais facilmente de aplicações web com possibilidade de adicionar plugins, sem que estes tenham de mexer com o código interno da aplicação, permite que uma framework use internamente a classe PHP-SES e melhorando consideravelmente a interacção entre a framework e a aplicação. Mas permite muito mais, permite até onde a sua imaginação chegar. <img src='http://joaopedropereira.com/blog/wp-includes/images/smilies/icon_biggrin.gif' alt=':D' class='wp-smiley' /> </p>
<h2>Basic Overview</h2>
<p>Quem quiser ver a documentação completa da framework, pode aceder <a href="http://www.wiki.portugal-a-programar.org/php:tutoriais:php-ses_basicos" target="_blank">aqui</a>. No entanto, aqui vai ficar uma explicação da classe e de como ela funciona, que é bastante simples.</p>
<p>A classe cria um array multi-dimensional onde guarda as funções e o respectivo evento a que elas foram anexadas. Sempre que se anexa uma função, a classe pode ou não verificar se a função existe, conforme os parâmetros que o programador introduzir. Se passar nesse teste, verifica se a função já está anexada a esse mesmo evento,  e só depois anexa a função (as funções caso seja um array).</p>
<p>Ao executar-mos um determinado evento, a classe verifica se este existe, e em caso afirmativo, percorre o array com as funções anexadas a esse evento, e executa-as a todas pela ordem com que forma anexadas. Caso a opção Auto_run esteja activa, a função vai ainda percorrer todas as funções definidas pelo utilizador (programador da aplicação, utilizador da classe entenda-se) e verifica se alguma coincide com a formatação obrigatória e com o nome do evento em questão (<span style="text-decoration: underline">um_nome_qualquer<strong>_handles_</strong>nome_do_evento</span>). Se essa função já estiver anexada ao array, e por consequente já tiver sido executada, a classe não a executa novamente. Se ainda não estiver anexada, a classe executa-a e, caso a opção Auto_index esteja activa, indexa a função ao array do respectivo evento.</p>
<h2>Sugestões de sintaxe dos nomes dos eventos</h2>
<p>Numa aplicação de grandes dimensões torna-se importante a sintaxe que usamos e a forma como organizamos os nomes dos eventos, para que não existam conflitos e seja mais fácil memorizar o grande número de eventos que uma aplicação possa ter. Para isso os nomes dos eventos necessitam de ter lógica, e apesar de serem um pouco compridos, serão óbvios. Primeiro teremos de ter em conta algumas considerações.<br />
Os nomes dos eventos podem conter qualquer carácter, incluindo pontos, que podem servir de separador entre as várias &#8220;secções virtuais&#8221; do nome do evento. No entanto nomes de eventos com pontos não serão possíveis de aceder através da funcionalidade Auto-Index e Auto-Run pois as funções não suportam, obviamente, este tipo de caracteres no seu nome. Assim sendo, sugiro o uso do <em>underscore</em> como separador.<br />
Em todas as aplicações há uma &#8220;secção&#8221; que deve existir em todos os eventos, que indica se o evento retrata alguma acção em PHP ou HTML. Ou seja, e apesar de todas as instruções em código PHP sejam de PHP, poderão existir eventos que retratam a impressão de texto para o browser, e assim sendo, o nome do evento deve começar por <strong>html_</strong>, senão, caso retratem acções PHP, como uma conexão a uma Base de Dados, a leitura de um ficheiro, o fim de um ciclo, a execução de uma qualquer estrutura de controlo, etc., deverão começar por <strong>php_</strong>.<br />
Para a secção de HTML, podemos ainda destinguir se nos estamos a referir a alguma parte genérica do HTML, como por exemplo, um menu, que seja constituído por vários elementos HTML, deve-se adicionar um <strong>generic_</strong> a seguir ao <strong>html_</strong>, ou seja, ficaria <strong>html_generic_menu</strong>, por exemplo.<br />
Caso seja em PHP, deve-se adicionar o nome da &#8220;categoria&#8221; da acção que se está a utilizar. Por exemplo se for uma acção qualquer relacionada com a base de dados MySQL, como inserir um registo, coloca-se o <strong>mysq_</strong> depois do <strong>php_</strong>, ficando, por exemplo, <strong>php_mysql_query_insert_user</strong>.</p>
<p><span style="text-decoration: underline"><strong>Nota:</strong></span> Isto é apenas um exemplo de nomenclatura dos eventos, nada de obrigatório.</p>
<h2>Exemplos e Demos</h2>
<h3>Plugins</h3>
<p>Actualmente, é quase obrigatório qualquer aplicação, seja ela Web ou Desktop, suportar plugins. Só que isto é muitas vezes uma fonte de dor de cabeça para quem programa em PHP, criar um sistema versátil suficiente para suportar plugins. O PHP-SES permite a criação de Aplicações Web que facilmente suportam plugins. Vamos ver o seguinte exemplo.</p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;"><span style="color: #b1b100;">require</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;..\..\Events.php&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Inicia a configuração</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">setConf</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Auto_run&quot;</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">setConf</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Auto_index&quot;</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Carrega os nomes ficheiros dos plugins.</span>
<span style="color: #000088;">$plugins</span> <span style="color: #339933;">=</span> <span style="color: #990000;">scandir</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;plugins&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Percorre o array com todos os ficheiros de plugins</span>
<span style="color: #b1b100;">foreach</span> <span style="color: #009900;">&#40;</span><span style="color: #000088;">$plugins</span> <span style="color: #b1b100;">as</span> <span style="color: #000088;">$index</span><span style="color: #339933;">=&gt;</span> <span style="color: #000088;">$file_name</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
        <span style="color: #666666; font-style: italic;">//Verifica se o index actual é um ficheiro e não uma pasta</span>
        <span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span><span style="color: #990000;">is_file</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;plugins/&quot;</span><span style="color: #339933;">.</span><span style="color: #000088;">$file_name</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
                <span style="color: #666666; font-style: italic;">//Inclui e executa o plugin</span>
                <span style="color: #b1b100;">require</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;plugins/&quot;</span><span style="color: #339933;">.</span><span style="color: #000088;">$file_name</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
                <span style="color: #666666; font-style: italic;">//Por uma questão de segurança e para não comprometer o funcionamento da aplicação</span>
                <span style="color: #666666; font-style: italic;">//Depois de se carregar um plugin deve-se sempre habilitar a classe</span>
                <span style="color: #666666; font-style: italic;">//Para não se dar o caso de algum plugin a desabilitar e não a habilitar novamente.</span>
                Events<span style="color: #339933;">::</span><span style="color: #004000;">Enable</span><span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #009900;">&#125;</span>
<span style="color: #009900;">&#125;</span>
&nbsp;
&nbsp;
<span style="color: #b1b100;">echo</span> <span style="color: #0000ff;">'&lt; !DOCTYPE html PUBLIC &quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot; &quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;&gt;
&lt;html xmlns=&quot;http://www.w3.org/1999/xhtml&quot;&gt;
&lt;head&gt;
        &lt;meta http-equiv=&quot;Content-Type&quot; content=&quot;text/html; charset=iso-8856-16&quot; /&gt;'</span><span style="color: #339933;">;</span>
        <span style="color: #666666; font-style: italic;">//Declara uma variável que permitirá adicionar conteúdo dentro dos plugins para a página</span>
        <span style="color: #000088;">$content</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;&quot;</span><span style="color: #339933;">;</span>
        <span style="color: #666666; font-style: italic;">//Corre todos os eventos anexados para quando os headers HTML são mostrados</span>
        <span style="color: #666666; font-style: italic;">//Esta é apenas um exemplo da sintaxe para o nome dos eventos.</span>
        Events<span style="color: #339933;">::</span><span style="color: #004000;">Run</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;html_headers&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #b1b100;">echo</span> <span style="color: #000088;">$content</span><span style="color: #339933;">;</span>
        <span style="color: #b1b100;">echo</span> <span style="color: #0000ff;">'&lt;title&gt;'</span><span style="color: #339933;">;</span>
&nbsp;
        <span style="color: #000088;">$content</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;PHP-SES Plugins Example&quot;</span><span style="color: #339933;">;</span>
&nbsp;
        Events<span style="color: #339933;">::</span><span style="color: #004000;">Run</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;html_show_title&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #b1b100;">echo</span> <span style="color: #000088;">$content</span><span style="color: #339933;">.</span><span style="color: #0000ff;">'&lt;/title&gt;
&lt;/head&gt;&lt;body&gt;'</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #b1b100;">echo</span> <span style="color: #0000ff;">&quot;&lt;h1&gt;Título&lt;/h1&gt;&quot;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #000088;">$content</span> <span style="color: #339933;">=</span> <span style="color: #0000ff;">&quot;&lt;a href=<span style="color: #000099; font-weight: bold;">\&quot;</span>#<span style="color: #000099; font-weight: bold;">\&quot;</span>&gt;Link1&lt;/a&gt;&lt;br /&gt;&quot;</span><span style="color: #339933;">;</span>
<span style="color: #666666; font-style: italic;">//Aqui corre os eventos que permitem alterar o menu</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">Run</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;html_generic_body_menu&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #b1b100;">echo</span> <span style="color: #000088;">$content</span><span style="color: #339933;">;</span>
<span style="color: #b1b100;">echo</span> <span style="color: #0000ff;">'&lt;/body&gt;
&lt;/html&gt;
'</span></pre></div></div>

<h3>JavaScript Events</h3>
<p>Muitas vezes torna-se cansativo estar a chamar vários exemplos por AJAX, ou até fazer a verificação no PHP através de QueryStrings. Assim sendo, e com este exemplo aplicado, basta, no evento JavaScript, chamar uma função, JavaScript também, o nome do evento em PHP, e depois é só ir adicionando funções PHP ao código PHP.</p>
<p><strong>index.php</strong></p>

<div class="wp_syntax"><div class="code"><pre class="html4strict" style="font-family:monospace;"><span style="color: #009900;">&lt; ?php </span>
<span style="color: #009900;">require<span style="color: #66cc66;">&#40;</span><span style="color: #ff0000;">&quot;..\..\Events.php&quot;</span><span style="color: #66cc66;">&#41;</span>;</span>
&nbsp;
<span style="color: #009900;">?&gt;</span>
<span style="color: #009900;">&lt; !DOCTYPE html PUBLIC <span style="color: #ff0000;">&quot;-//W3C//DTD XHTML 1.0 Transitional//EN&quot;</span> <span style="color: #ff0000;">&quot;http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot;</span>&gt;</span>
<span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">html</span> xmlns<span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;http://www.w3.org/1999/xhtml&quot;</span>&gt;</span>
<span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">head</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">meta</span> <span style="color: #000066;">http-equiv</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;Content-Type&quot;</span> <span style="color: #000066;">content</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;text/html; charset=iso-8856-16&quot;</span> <span style="color: #66cc66;">/</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">script</span> <span style="color: #000066;">type</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;text/javascript&quot;</span>&gt;</span>
        function RunEvent(event_name){
&nbsp;
                if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
                        xmlhttp=new XMLHttpRequest();
                } else {// code for IE6, IE5
                        xmlhttp=new ActiveXObject(&quot;Microsoft.XMLHTTP&quot;);
                }
&nbsp;
                xmlhttp.onreadystatechange=function(){
                        if (xmlhttp.readyState==4 <span style="color: #ddbb00;">&amp;&amp; xmlhttp.status==200){</span>
<span style="color: #ddbb00;">                                document.getElementById(&quot;count_number&quot;).innerHTML=xmlhttp.responseText;</span>
                        }
                }
&nbsp;
                xmlhttp.open(&quot;GET&quot;,&quot;run.php?event=&quot; + event_name + &quot;&quot;,true);
                xmlhttp.send();
        }
        <span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">script</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">title</span>&gt;</span>JavaScript Buttons Example<span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">title</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">head</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">body</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">input</span> <span style="color: #000066;">type</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;button&quot;</span> <span style="color: #000066;">name</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;btn_sample&quot;</span> <span style="color: #000066;">id</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;btn_sample&quot;</span> <span style="color: #000066;">onclick</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;RunEvent('html_buttons_click_btn_sample')&quot;</span>  <span style="color: #000066;">value</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;Test me. Click me.&quot;</span> <span style="color: #66cc66;">/</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #000000; font-weight: bold;">div</span> <span style="color: #000066;">id</span><span style="color: #66cc66;">=</span><span style="color: #ff0000;">&quot;count_number&quot;</span>&gt;</span>0<span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">div</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">body</span>&gt;</span>
        <span style="color: #009900;">&lt;<span style="color: #66cc66;">/</span><span style="color: #000000; font-weight: bold;">html</span>&gt;</span></pre></div></div>

<p><strong>run.php</strong></p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;">&nbsp;
<span style="color: #b1b100;">require</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;..\..\Events.php&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span><span style="color: #339933;">!</span><span style="color: #990000;">defined</span><span style="color: #009900;">&#40;</span>IS_AUTH<span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
        <span style="color: #990000;">exit</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Se a variável $_GET[&quot;event&quot;] não estiver declarada, termina a execução da página.</span>
<span style="color: #b1b100;">if</span> <span style="color: #009900;">&#40;</span><span style="color: #339933;">!</span><span style="color: #990000;">isset</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$_GET</span><span style="color: #009900;">&#91;</span><span style="color: #0000ff;">&quot;event&quot;</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
        <span style="color: #b1b100;">echo</span> <span style="color: #0000ff;">&quot;Não foi definido nenhum evento.&quot;</span><span style="color: #339933;">;</span>
        <span style="color: #990000;">exit</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Define algumas configurações para não ser necessário anexar a função.</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">setConf</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Auto_run&quot;</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">setConf</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;Auto_index&quot;</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Declara uma função anexada ao clique do botão</span>
<span style="color: #000000; font-weight: bold;">function</span> update_file_handles_html_buttons_click_btn_sample <span style="color: #009900;">&#40;</span><span style="color: #009900;">&#41;</span><span style="color: #009900;">&#123;</span>
        <span style="color: #666666; font-style: italic;">//Vai buscar o número de clicks que o botão já tem</span>
        <span style="color: #000088;">$number_clicks</span> <span style="color: #339933;">=</span> <span style="color: #990000;">file_get_contents</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;clicks.txt&quot;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
&nbsp;
        <span style="color: #666666; font-style: italic;">//Escreve outra vez para o ficheiro adicionando um clique</span>
        <span style="color: #990000;">file_put_contents</span><span style="color: #009900;">&#40;</span><span style="color: #0000ff;">&quot;clicks.txt&quot;</span><span style="color: #339933;">,</span> <span style="color: #000088;">$number_clicks</span> <span style="color: #339933;">+</span> <span style="color: #cc66cc;">1</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span>
        <span style="color: #b1b100;">echo</span> <span style="color: #000088;">$number_clicks</span> <span style="color: #339933;">+</span> <span style="color: #cc66cc;">1</span><span style="color: #339933;">;</span>
<span style="color: #009900;">&#125;</span>
&nbsp;
<span style="color: #666666; font-style: italic;">//Corre todos os eventos associados ao clique do botão.</span>
Events<span style="color: #339933;">::</span><span style="color: #004000;">Run</span><span style="color: #009900;">&#40;</span><span style="color: #000088;">$_GET</span><span style="color: #009900;">&#91;</span><span style="color: #0000ff;">&quot;event&quot;</span><span style="color: #009900;">&#93;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

<p>Pode ver os exemplos em funcionamento, aceda <a href="http://scorchserver.freehosting.com/php_ses_examples/">aqui</a>.</p>


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		<slash:comments>2</slash:comments>
		<feedburner:origLink>http://joaopedropereira.com/blog/2010/07/21/php-simple-events-system-overview/</feedburner:origLink></item>
		<item>
		<title>Não desaproveite o seu Footer!</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/lrusWwQ3KSU/</link>
		<comments>http://joaopedropereira.com/blog/2010/06/03/nao-desaproveite-o-seu-footer/#comments</comments>
		<pubDate>Thu, 03 Jun 2010 22:08:57 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Optimização]]></category>
		<category><![CDATA[Usabilidade]]></category>
		<category><![CDATA[Webdevelopment]]></category>
		<category><![CDATA[footer]]></category>
		<category><![CDATA[sitemap]]></category>
		<category><![CDATA[social]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=800</guid>
		<description><![CDATA[Ser WebDeveloper não é uma tarefa fácil, não só temos de estar sempre actualizados relativamente ao que o mercado de trabalho exige relativamente a conhecimentos em ferramentas, frameworks e linguagens de programação como também temos de estar em cima dos hot topics na área do WebDesign e Usabilidade. Construir um site do zero não é [...]]]></description>
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			<a href="http://api.tweetmeme.com/share?url=http%3A%2F%2Fjoaopedropereira.com%2Fblog%2F2010%2F06%2F03%2Fnao-desaproveite-o-seu-footer%2F"><br />
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<p>Ser WebDeveloper não é uma tarefa fácil, não só temos de estar sempre actualizados relativamente ao que o mercado de trabalho exige relativamente a conhecimentos em ferramentas, frameworks e linguagens de programação como também temos de estar em cima dos hot topics na área do WebDesign e Usabilidade.</p>
<p>Construir um site do zero não é uma tarefa simples, pois exige muito planeamento, estruturação e pensamento criativo e ser criativo é muitas vezes uma dor de cabeça pois quando mais precisamos da nossa amiga criatividade ela pode não aparecer&#8230; E é preciso saber estimulá-la.</p>
<p>Tenho visto na Web Portuguesa bons sites a desaproveitar algumas áreas do site, e neste artigo vou referir-me ao footer.</p>
<p>Além do típico Acordo de Privacidade e Informações Legais (que é sempre uma boa forma de aproveitar o espaço) existem algum conteúdo especifico que pode e deve ser usado no footer.</p>
<p><img class="aligncenter size-medium wp-image-801" title="Sitemap" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/06/inside_sitemap-222x300.jpg" alt="Sitemap" width="222" height="300" /><strong> Sitemap</strong> &#8211; É uma excelente forma de utilizar o espaço do footer pois é útil para os visitantes que se encontrem perdidos ou que simplesmente tenham pressa para encontrar o que procuram sem terem de fazer um scanning por todo o conteúdo do site, que pode ser moroso e por consequência pode fazer-nos perder utilizadores e possíveis clientes. Ninguém gosta de não encontrar rapidamente o que procura e cabe-nos a nós dar-lhes o que desejam.</p>
<p><img class="aligncenter size-medium wp-image-802" title="Contactos" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/06/ContactUs-300x200.jpg" alt="Contactos" width="300" height="200" /></p>
<p><strong>Informação de Contacto </strong>- É também muito importante ter informações de como pode ser feito o contacto com o dono do site ou então criar um formulário de contacto para facilitar o contacto.</p>
<p><span style="text-decoration: underline;">Ferramentas e Inspiração:</span><br />
<a title="15 Great Online Form Building Tools" href="http://www.tripwiremagazine.com/2010/05/15-great-online-form-building-tools.html" target="_blank">15 Great Online Form Building Tools</a><br />
<a title="Beautiful Contact Forms For Your Inspiration" href="http://www.webdesignerdepot.com/2010/05/beautiful-contact-forms-for-your-inspiration/" target="_blank">Beautiful Contact Forms For Your Inspiration</a></p>
<p><strong> Sobre</strong> &#8211; A par da informação de contacto, uma rápida descrição do que é aquela página, quem é a empresa, quem é a pessoa, etc. algo que faça os utilizadores conhecer melhor.</p>
<p><img class="aligncenter size-medium wp-image-809" title="Web2.0 Logos" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/06/web2_logos1-300x251.jpg" alt="" width="300" height="251" /></p>
<p><strong> Social Media</strong> &#8211;  É sem dúvida uma excelente forma de ganhar mais tráfego e/ou de manter os utilizadores actualizados quanto a informações relativos ao produto/conteúdo que o site tem ou vende.</p>
<p>Esta é uma lista de sugestões do que pode ser colocado no footer dos seus sites e dos sites que desenvolve, contudo a lista não termina por aqui existem muito mais coisas que podem ser colocados no footer, feed do Flickr com imagens interessantes, publicidade, formulários para subscrever a newsletters, feeds do twitter e/ou facebook, etc. etc. etc. Apenas a imaginação e originalidade de cada um é o limite.</p>


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		<title>New Features WordPress 3 Review</title>
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		<comments>http://joaopedropereira.com/blog/2010/04/21/wordpress-3-review/#comments</comments>
		<pubDate>Wed, 21 Apr 2010 20:23:10 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[PHP]]></category>
		<category><![CDATA[Tecnologia]]></category>
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		<category><![CDATA[php]]></category>
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		<category><![CDATA[wordpress]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=752</guid>
		<description><![CDATA[É provavelmente ainda um bocado cedo para falar do WordPress 3.0 pois o lançamento desta só está previsto para finais de Maio, mas tenho vindo a brincar um pouco com ele  e com as suas novas funcionalidades. A versão 3.0 do WordPress promete um visual mais soft da página de administração, vai também introduzir uma [...]]]></description>
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<p>É provavelmente ainda um bocado cedo para falar do WordPress 3.0 pois o lançamento desta só está previsto para finais de Maio, mas tenho vindo a brincar um pouco com ele  e com as suas novas funcionalidades.</p>
<p>A versão 3.0 do WordPress promete um visual mais soft da página de administração, vai também introduzir uma nova default theme, a <em>&#8220;Twenty Ten&#8221;</em>, que permite personalizar o fundo e as opções do cabeçalho ( header ), possibilidade de criar os menus com categorias, tags, posts, links externos, etc., entre outras modificações que podem ver na <a title="WordPress -- Version 3.0" href="http://codex.wordpress.org/Version_3.0" target="_blank">página oficial</a>.</p>
<p><a href="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/Twenty-Ten.png"><img class="aligncenter size-medium wp-image-762" title="Twenty Ten" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/Twenty-Ten-300x240.png" alt="" width="300" height="240" /></a></p>
<p>Neste post vou dar realce a apenas duas características que surgirão na versão 3.0 do WordPress, ou pelo menos que estão prevista e que estão em desenvolvimento.</p>
<h2>WordPress + WordPress MU == WordPress 3.0</h2>
<p>O WordPress MU ou WordPress Multi-User era uma versão modificada do sistema WordPress para permitir redes de blogs numa só instalação.</p>
<p><strong><span style="text-decoration: underline;">Site:</span></strong> <a title="WordPress MU" href="http://mu.wordpress.org/" target="_blank">http://mu.wordpress.org</a></p>
<p>Create a Network of Multiple Sites on WordPress 3.0</p>
<p>É tão simples como adicionar no ficheiro wp-config.php a seguinte linha:</p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;"><span style="color: #990000;">define</span> <span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'WP_ALLOW_MULTISITE'</span><span style="color: #339933;">,</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

<p>Seleccionar o menu<em> Tools -&gt; Network</em> e seguir as instruções.</p>
<p>Este é o menu que vos espera depois de tudo configurado.</p>
<p><img class="aligncenter size-full wp-image-757" title="WordPress Network Menu" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/menu.png" alt="" width="150" height="290" /></p>
<p><strong><span style="text-decoration: underline;">Ver artigo:</span></strong> <a title="Create a Network" href="http://codex.wordpress.org/User:Andrea/Create_A_Network" target="_blank">http://codex.wordpress.org/User:Andrea/Create_A_Network</a></p>
<h2>Custom Post Types on WordPress 3.0</h2>
<p>Quem já teve de desenvolver uma theme para WordPress um pouco mais complexo provavelmente já teve de fazer uns quantos hacks de forma a conseguir ter estilos diferentes para categorias diferentes&#8230; Os developers do WordPress pensaram em nós e decidiram tornar a possibilidade de ter vários estilos para diferentes tipos de posts de uma forma mais simples na versão 3.0 do WordPress.</p>
<p>Para tirar partido desta funcionalidade é necessário adicionar o seguinte código no ficheiro wp-content/themes/yourtheme/functions.php :</p>

<div class="wp_syntax"><div class="code"><pre class="php" style="font-family:monospace;">register_post_type<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'testemunials'</span><span style="color: #339933;">,</span> <span style="color: #990000;">array</span><span style="color: #009900;">&#40;</span>
    <span style="color: #0000ff;">'label'</span> <span style="color: #339933;">=&gt;</span> __<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'Testemunials'</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'singular_label'</span> <span style="color: #339933;">=&gt;</span> __<span style="color: #009900;">&#40;</span><span style="color: #0000ff;">'Testemunial'</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'description'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #0000ff;">'Here goes my testemunials'</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'public'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'show_ui'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #009900; font-weight: bold;">true</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'capability_type'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #0000ff;">'post'</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'hierarchical'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #009900; font-weight: bold;">false</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'rewrite'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #009900; font-weight: bold;">false</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'query_var'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #009900; font-weight: bold;">false</span><span style="color: #339933;">,</span>
    <span style="color: #0000ff;">'supports'</span> <span style="color: #339933;">=&gt;</span> <span style="color: #990000;">array</span><span style="color: #009900;">&#40;</span>
        <span style="color: #0000ff;">'title'</span><span style="color: #339933;">,</span>
        <span style="color: #0000ff;">'editor'</span><span style="color: #339933;">,</span>
        <span style="color: #0000ff;">'author'</span><span style="color: #339933;">,</span>
        <span style="color: #0000ff;">'excerpts'</span><span style="color: #339933;">,</span>
        <span style="color: #0000ff;">'comments'</span>
    <span style="color: #009900;">&#41;</span>
<span style="color: #009900;">&#41;</span><span style="color: #009900;">&#41;</span><span style="color: #339933;">;</span></pre></div></div>

<p><img class="aligncenter size-medium wp-image-773" title="Menu Custom Post-Type" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/menu2-143x300.png" alt="" width="143" height="300" /></p>
<p>Tal como é possível definir vários tipos de posts também é possível utilizar esta funcionalidade para páginas diferentes alterando o parâmetro &#8216;capability_type&#8217; para &#8216;capability_type&#8217;=&gt;&#8217;page&#8217;.</p>
<p><strong><span style="text-decoration: underline;">Function Reference/register post type:</span></strong> <a title="Function Reference/register post type" href="http://codex.wordpress.org/Function_Reference/register_post_type" target="_blank">http://codex.wordpress.org/Function_Reference/register_post_type</a></p>


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		<title>Patrocinio – CD Submundos</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/-ZVm9VBHx-M/</link>
		<comments>http://joaopedropereira.com/blog/2010/04/20/patrocinio-submundos/#comments</comments>
		<pubDate>Tue, 20 Apr 2010 22:36:07 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Infos]]></category>
		<category><![CDATA[Uncategorized]]></category>
		<category><![CDATA[patrocinio]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=779</guid>
		<description><![CDATA[É com orgulho que vos apresento o mais recente projecto patrocinado pelo The Blog of a WebDeveloper. O CD Submundos um Projecto Nacional do Mundo da Música. O CD Submundos é um CD criado com músicas dos membros do fórum submundos, e partilhado pela Internet, com a finalidade de divulgar os seus talentos. O CD [...]]]></description>
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<p>É com orgulho que vos apresento o mais recente projecto patrocinado pelo <em>The Blog of a WebDeveloper. </em>O CD Submundos um Projecto Nacional do Mundo da Música.</p>
<p><img class="aligncenter size-medium wp-image-780" title="Submundos" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/submundos-300x77.gif" alt="" width="300" height="77" /></p>
<p>O CD Submundos é um CD criado com músicas dos membros do fórum submundos, e partilhado pela Internet, com a finalidade de divulgar os seus talentos. O CD Submundos é partilhado na Internet através de vários sites, com as melhores músicas escolhidas através de votação pelos membros.<br />
Esta versão contou com 7 músicas, organizadas de acordo com a maior percentagem de votos.</p>
<p>CD Submundos:</p>
<p>1 &#8211; Insubmysso &#8211; 69<br />
2 &#8211; Dj Bu5a &#8211; My Soul (DJ DeepBlue &amp; Maurillo Remix)<br />
3 &#8211; Isolaz &#8211; Mudam os Tempos<br />
4 &#8211; Mister Music &#8211; How I feel<br />
5 &#8211; Vedeta &#8211; Honey i got money<br />
6 &#8211; dmL &#8211; Sem Ar<br />
7 &#8211; MRK &#8211; Se Soubesses (O Quanto)</p>
<p><span style="text-decoration: underline;"><strong>Download:</strong></span><strong> </strong><span style="text-decoration: underline;">[35mb]</span></p>
<p><a title="CD Submundos - HotFile" href="http://hotfile.com/dl/38540864/aaae995/CD_Submundos.zip.html" target="_blank">hotfile</a> | <a title="CD Submundos - MegaUpload" href="http://www.megaupload.com/?d=SYM5C44S" target="_blank">megaupload</a></p>


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		<title>PHP Security Check-List CheatSheet</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/iGXskrNv2i8/</link>
		<comments>http://joaopedropereira.com/blog/2010/04/18/php-security-check-list-cheatsheet/#comments</comments>
		<pubDate>Sun, 18 Apr 2010 13:41:56 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[PHP]]></category>
		<category><![CDATA[Segurança]]></category>
		<category><![CDATA[Webdevelopment]]></category>
		<category><![CDATA[cheatsheet]]></category>
		<category><![CDATA[php]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=743</guid>
		<description><![CDATA[Para cada projecto que tenho desenvolvido ultimamente utilizando a linguagem de programação server-side PHP, tenho-me guiado por uma checklist de forma a não me esquecer  de nada evitando assim falhas graves nas aplicações que desenvolvo. Pois a segurança é uma das preocupações que tenho. Esta checklist aborda diversas situações como, casos gerais, casos de input, [...]]]></description>
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<p>Para cada projecto que tenho desenvolvido ultimamente utilizando a linguagem de programação server-side PHP, tenho-me guiado por uma checklist de forma a não me esquecer  de nada evitando assim falhas graves nas aplicações que desenvolvo. Pois a segurança é uma das preocupações que tenho.</p>
<p>Esta checklist aborda diversas situações como, casos gerais, casos de input, file uploads, autenticação, entre outros.</p>
<div id="attachment_744" class="wp-caption aligncenter" style="width: 234px"><a href="http://joaopedropereira.com/files/phpsec_cheatsheet.pdf"><img class="size-medium wp-image-744" title="PHP Security CheckList" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/04/phpsec_cheatsheet-224x300.png" alt="" width="224" height="300" /></a><p class="wp-caption-text">Click on image to download</p></div>
<p>Recomendo vivamente a sua utilização e até sugestões de melhorias, apesar de ela não ser da minha autoria.</p>
<p>O que acham desta checklist? Conhecem alguma melhor? Como se guiam no desenvolvimento de aplicações web de forma  a manter a segurança da mesma?</p>


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		<item>
		<title>ConnectionDetails.info :: Information About Your Connection</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/eoCrkML5JtI/</link>
		<comments>http://joaopedropereira.com/blog/2010/03/17/connectiondetails-info-information-about-your-connection/#comments</comments>
		<pubDate>Wed, 17 Mar 2010 23:33:30 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Projectos]]></category>
		<category><![CDATA[Tecnologia]]></category>
		<category><![CDATA[ConnectionDetails.info]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=739</guid>
		<description><![CDATA[Hoje, dia 17 de Março de 2010, lanço uma primeira versão &#8220;estável&#8221; de um serviço que já corre à algum tempo no dominio ConnectionDetails.info. Este serviço pretende dar informações precisas relativas ao browser bem como algumas características da ligação do utilizador. Numa primeira fase as informações disponíveis são: IP Browser Sistema Operativo De onde veio [...]]]></description>
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<p>Hoje, dia 17 de Março de 2010, lanço uma primeira versão &#8220;estável&#8221; de um serviço que já corre à algum tempo no dominio <a title="ConnectionDetails.info :: Information About Your Connection" href="http://connectiondetails.info">ConnectionDetails.info</a>.</p>
<p>Este serviço pretende dar informações precisas relativas ao browser bem como algumas características da ligação do utilizador. Numa primeira fase as informações disponíveis são:</p>
<ul>
<li>IP</li>
<li>Browser</li>
<li>Sistema Operativo</li>
<li>De onde veio o utilizador (Referrer)</li>
<li>Porta que está a ser usada para efectuar a ligação</li>
<li>Velocidade da ligação</li>
</ul>
<p>Ainda existem alguns bugs quer na aquisição de informações quer no design. Agradecia que fosse feito o report das falhas encontradas e imprecisões.</p>
<p>No futuro pretendo lançar uma versão mais precisa a identificar as informações, bem como adicionar funcionalidades como tentar descobrir qual os routers por trás da ligação, identificar características especificas do browser como as versões de JavaScript suportadas, CSS, versão do Java e do Flash em utilização, etc. Uma outra funcionalidade é o fetching das bases de dados de vulnerabilidades existentes online de forma a encontrar falhas de segurança para a versão dos software instalados.</p>
<p>Agradeço desde todo o suporte que possam dar em especial ao nível de sugestões de funcionalidades, bug catching, criticas/comentários e divulgação.</p>


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		<feedburner:origLink>http://joaopedropereira.com/blog/2010/03/17/connectiondetails-info-information-about-your-connection/</feedburner:origLink></item>
		<item>
		<title>Vulnerabilidades Site Novas Oportunidades</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/__80ooUUdEA/</link>
		<comments>http://joaopedropereira.com/blog/2010/03/08/vulnerabilidades-site-novas-oportunidades/#comments</comments>
		<pubDate>Mon, 08 Mar 2010 14:43:23 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Segurança]]></category>
		<category><![CDATA[Webdevelopment]]></category>
		<category><![CDATA[SQL Injection]]></category>
		<category><![CDATA[vulnerabilidade]]></category>
		<category><![CDATA[xss]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=722</guid>
		<description><![CDATA[Já há algum tempo que tenho andado a investigar sites nacionais em busca de falhas de segurança e quase todos as têm, as mais frequentes são as falhas XSS mas também é muito comum encontrar falhas de SQL Injection. Hoje tive acesso através de um tweet do Público (http://bit.ly/aU0kuy) à informação de que o site [...]]]></description>
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<p>Já há algum tempo que tenho andado a investigar sites nacionais em busca de falhas de segurança e quase todos as têm, as mais frequentes são as falhas XSS mas também é muito comum encontrar falhas de SQL Injection.</p>
<p style="text-align: center;"><a href="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/logo.png"><img class="size-full wp-image-728 aligncenter" title="Novas Oportunidades" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/logo.png" alt="" width="301" height="157" /></a></p>
<p>Hoje tive acesso através de um tweet do Público (<a title="Site das Novas Oportunidades atacado por hacker" href="http://bit.ly/aU0kuy" target="_blank">http://bit.ly/aU0kuy</a>) à informação de que o site das <a title="Novas Oportunidades" href="http://www.novasoportunidades.gov.pt/" target="_blank">Novas Oportunidades</a> tinha sido explorado e alterado por  alguém&#8230; Decidi então enquanto era tempo verificar as falhas que existiam no site e qual o meu espanto (not) quando vejo presentes falhas de XSS, falhas de SQL Injection e falhas de validação de parâmetros que permitem Impersonation Attack através de injecção de URL.</p>
<p>O ataque relatado pelo público foi feito através de SQL Injection possivelmente na página seguinte pois esta está totalmente aberta a ataques deste género: <a href="http://testemunhos.novasoportunidades.gov.pt/detalhe_video.aspx?id=9&amp;tipo=1" target="_blank" class="broken_link">http://testemunhos.novasoportunidades.gov.pt/detalhe_video.aspx</a></p>
<p><a href="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-3.png"><img class="aligncenter size-thumbnail wp-image-736" title="Novas Oportunidades SQL Injection" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-3-150x150.png" alt="" width="150" height="150" /></a></p>
<p>O ataque que referi relativo a problemas de validação de parâmetros que permitem injecção de URL: <a href="http://www.novasoportunidades.gov.pt/outerFrame.jsp?link=http://joaopedropereira.com/blog/ " target="_blank">http://www.novasoportunidades.gov.pt/outerFrame.jsp?link=http://joaopedropereira.com/blog/</a></p>
<p><a href="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-2.png"><img class="aligncenter size-thumbnail wp-image-735" title="Novas Oportunidades Impersonation Attack" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-2-150x150.png" alt="" width="150" height="150" /></a></p>
<p>Com alguma imaginação pode-se fazer alguns ataques interessantes a partir daqui&#8230;</p>
<p>Na pesquisa também podemos facilmente fazer ataques de XSS (Cross Site Scripting) como referi anteriormente: <a href="http://www.novasoportunidades.gov.pt/np4/q?q=%3Cscript%3Ealert%28%22The+Blog+of+a+WebDeveloper%22%29%3C%2Fscript%3E" target="_blank">http://www.novasoportunidades.gov.pt/np4/q?q=%3Cscript%3Ealert%28%22The+Blog+of+a+WebDeveloper%22%29%3C%2Fscript%3E</a></p>
<p><a href="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-1.png"><img class="aligncenter size-thumbnail wp-image-734" title="Novas Oportunidades XSS Attack" src="http://joaopedropereira.com/blog/wp-content/uploads/2010/03/Screenshot-1-150x150.png" alt="" width="150" height="150" /></a></p>
<p>Isto mostra a preparação e conhecimentos ao nível de segurança informática que os WebDevelopers que o estado contrata têm&#8230; Atenção este não é o único site governamental com problemas graves de segurança, existem mais e talvez que transaccionem dados mais importantes&#8230;</p>
<p><strong><span style="text-decoration: underline;">Nota</span></strong>: Este post não tem como intuito incentivar qualquer tipo de ataque informático, pretende apenas informar e alertar para os problemas informáticos que podem surgir num futuro nas infraestruturas governamentais (e não só). É importante ter as nossas plataformas o mais seguras possíveis, para não sermos surpreendidos um dia.</p>
<p><strong><span style="text-decoration: underline;">EDIT</span></strong></p>
<p>As falhas estão a ser corrigidas, quase completas por isso para registo futuro adicionei screenshots das falhas. É também de valor ler e participar nos comentários a este post que estão a dar uma boa análise do Web Development nacional.</p>
<p><strong>EDIT 2</strong></p>
<p>Governo desmente ataque informático: <a title="Portal Novas Oportunidades não foi alvo de ataque informático" href="http://www.governo.gov.pt/pt/GC18/Governo/Ministerios/MTSS/Notas/Pages/20100308_MTSS_Com_Novas_Oportunidades.aspx" target="_blank">Portal Novas Oportunidades não foi alvo de ataque informático </a>. Provavelmente precisam que venha algo abaixo e que cause danos a muitas pessoas para admitirem os erros&#8230;</p>


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		<title>Super Blog Awards</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/Xgq55dZzSsY/</link>
		<comments>http://joaopedropereira.com/blog/2010/02/26/super-blog-awards/#comments</comments>
		<pubDate>Fri, 26 Feb 2010 23:31:47 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Projectos]]></category>
		<category><![CDATA[Tecnologia]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=711</guid>
		<description><![CDATA[E já começou a fase de Votação para o Super Bock Super Blog Awards, onde serão eleitos os melhores blogs de Portugal e de Angola em diversas áreas como a que está este blog inscrito Tecnologia. Como é que podem votar no meu blog? Fácil: basta clicar no dístico de participação, que colocaste no teu [...]]]></description>
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<p style="text-align: center;"><a href="http://www.superbock.pt/SuperBrand/Super_Blog_Awards_2009/Votar.aspx?blog=6c3ce821-1c81-482d-9c51-4e46fda92656"><img class="aligncenter" title="Super Blog Awards" src="http://www.superbock.pt/SuperBrand/Super_Blog_Awards_2009/Disticos/blog_3.png" alt="" width="150" height="150" /></a></p>
<p style="text-align: center;">E já começou a fase de Votação para o Super Bock Super Blog Awards, onde serão eleitos os melhores blogs de Portugal e de Angola em diversas áreas como a que está este blog inscrito Tecnologia.</p>
<h2>Como é que podem votar no meu blog?</h2>
<blockquote><p>Fácil: basta clicar no dístico de participação, que colocaste no teu blog aquando da fase de inscrição. Em alternativa, podes pesquisar no site pelo nome do blog ou autor, e aceder ao perfil de cada blog no site Super Bock para registares o teu voto.</p></blockquote>
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		<title>Processamento Paralelo com xargs</title>
		<link>http://feedproxy.google.com/~r/joaopedropereira/~3/Hn_ab4oAym0/</link>
		<comments>http://joaopedropereira.com/blog/2010/02/22/processamento-paralelo-xargs/#comments</comments>
		<pubDate>Mon, 22 Feb 2010 22:54:35 +0000</pubDate>
		<dc:creator>João Pedro Pereira</dc:creator>
				<category><![CDATA[Bash Scripting]]></category>
		<category><![CDATA[linux]]></category>
		<category><![CDATA[cp]]></category>
		<category><![CDATA[find]]></category>
		<category><![CDATA[man]]></category>
		<category><![CDATA[nmap]]></category>
		<category><![CDATA[performance]]></category>
		<category><![CDATA[processamento]]></category>
		<category><![CDATA[rm]]></category>
		<category><![CDATA[xargs]]></category>

		<guid isPermaLink="false">http://joaopedropereira.com/blog/?p=695</guid>
		<description><![CDATA[Com processadores multi-core semi-parados na maior parte das nossas tarefas e com a necessidade de processar grandes quantidades de informação / ficheiros é importante aproveitar toda a potencialidade de todos os núcleos. Nos sistemas Unix (neste caso testei num sistema Linux com a distro Ubuntu) é possível separar uma tarefa em vários processos de forma [...]]]></description>
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<p>Com processadores multi-core semi-parados na maior parte das nossas tarefas e com a necessidade de processar grandes quantidades de informação / ficheiros é importante aproveitar toda a potencialidade de todos os núcleos.</p>
<p>Nos sistemas Unix (neste caso testei num sistema Linux com a distro Ubuntu) é possível separar uma tarefa em vários processos de forma a que a tarefa seja distribuida por mais que um núcleo do processador (no caso dos processadores multi-core) e por vários processos (jobs) que podem ser executados em simultâneo não dependendo que o primeiro acabe para executar o segundo podendo ter vários a correr ao mesmo tempo aumentando assim a performance da acção.</p>
<p>Este comando suporta a opção -P com a qual podemos especificar a quantidade de processos (jobs) a correr em paralelo.</p>
<pre>$ man xargs
(...)
<strong> --max-procs=max-procs
-P max-procs</strong>
Run  up  to max-procs processes at a time; the default is 1.
If max-procs is 0, xargs will run as many processes as possible  at a  time.
Use the -n option with -P; otherwise chances are that only one exec will be done.
(...)</pre>
<h2>Exemplo de Utilização</h2>
<pre>$ ls . | xargs -P 0 -i -t cp -R {} ../novo/</pre>
<h3>Decompondo o Exemplo</h3>
<p><strong>Listagem dos ficheiros da pasta</strong></p>
<pre>$ ls .</pre>
<p><strong>Xargs</strong></p>
<pre>xargs -P 0 -i -t</pre>
<p>&#8220;-P 0&#8243; utiliza o número máximo de processos<br />
&#8220;-t&#8221; verbose mode activo</p>
<p><strong>Cópia</strong></p>
<pre>cp -R {} ../novo/</pre>
<p>&#8220;-R&#8221; copia de forma recursiva as pastas existentes<br />
&#8220;{}&#8221; existe devido ao parâmetro &#8220;-i&#8221; do comando xargs utilizado, que corresponde a cada ficheiro/pasta que queremos copiar<br />
&#8220;../novo&#8221; pasta de destino</p>
<h2>Mais exemplos</h2>
<p>Apagar todos os ficheiros com a extensão pdf</p>
<pre>find ./ -name "*.pdf" | xargs -t -Istr rm str</pre>
<p>Converter ficheiros pdf (.pdf) para ficheiros de texto simples (.txt)</p>
<pre>find ./ -name "*.pdf" | xargs -Istr pdftotext str</pre>
<p>Nestes exemplos podem acrescentar sempre a opção &#8220;-P x&#8221; em que x é o valor de processos que querem a correr em paralelo, em algumas situações permite-nos aumentar a performance do processamento através da resolução de tarefas em paralelo como veremos a seguir.</p>
<h2>Testes de Performance</h2>
<pre>:~/teste$ ls
teste1  teste2
~/teste$ ls teste1/ | wc
33      58    1036
~/teste$ ls teste2/ | wc
33      58    1036

~/teste$ time find ./teste1/ -name "*.pdf" | xargs -Istr pdftotext str
real	1m9.805s
user	0m44.795s
sys	0m6.564s

~/teste$ time find ./teste2/ -name "*.pdf" | xargs -P 6 -Istr pdftotext str
real	0m39.911s
user	0m44.523s
sys	0m6.304s</pre>
<p>Utilizando exactamente os mesmos ficheiros vemos alguma diferença a executar a mesma operação com e sem processamento distribuído da tarefa, que é realizada por diversos processos executados em paralelo.</p>
<pre>~/teste$ time find ./teste1/ -name "*.pdf" | xargs -Istr rm str
real	0m0.296s
user	0m0.060s
sys	0m0.088s

~/teste$ time find ./teste2/ -name "*.pdf" | xargs -P 6 -Istr rm str
real	0m0.163s
user	0m0.060s
sys	0m0.084s</pre>
<p>Novamente podemos verificar um aumento na performance das acções com o processamento em paralelo.</p>
<h2>Outras utilizações</h2>
<p>Além destas tarefas que foram mostradas em cima digamos, do dia-a-dia de qualquer utilizador de um sistema Unix que tenha descoberto as maravilhas da consola, podem ser destacadas utilizações mais direccionadas a áreas de trabalho:</p>
<ul>
<li>utilização do xargs em conjunto com o ping para detectar vários hosts simultaneamente diminuindo o tempo de espera para grandes pesquisas</li>
<li>utilização do xargs em conjunto com o nmap. O nmap nos scans não utiliza muita bandwidth para não ser detectado e então podemos fazer scan a mais que um host em simultâneo aproveitando as capacidades da ligação e da máquina</li>
<li>conversão de discografias completas ou de albuns inteiros de fotos</li>
</ul>
<p>Mais ideias diferentes?</p>
<h2>Man Pages</h2>
<p><a title="Man cp" href="http://unixhelp.ed.ac.uk/CGI/man-cgi?cp" target="_blank">$ man cp</a><br />
<a title="Man rm" href="http://unixhelp.ed.ac.uk/CGI/man-cgi?rm" target="_blank">$ man rm</a><br />
<a title="Man xargs" href="http://unixhelp.ed.ac.uk/CGI/man-cgi?xargs" target="_blank">$ man xargs</a><br />
<a title="Man ls" href="http://unixhelp.ed.ac.uk/CGI/man-cgi?ls" target="_blank">$ man ls</a><br />
<a title="Man find" href="http://unixhelp.ed.ac.uk/CGI/man-cgi?find" target="_blank">$ man find</a></p>


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