<?php
//The first step is to start a php session calling the special function
session_start();
//The seccond step is to generate a string randomly using rand function
//I'll choose to get a random number 6 numbers in length
$randomcode = rand(0, 999999);
//Now we need a background image to write the random number to it
$captchafromimage = imagecreatefrompng("captcha.png");
//Setting font color
$color = ImageColorAllocate ($captchafromimage, 50, 50, 50);
//Ta da, here we are, writing the random generated code to the image
imagestring($captchafromimage, 6, 50, 2, $randomcode, $color);
//Now the random number is coded into md5 secure format
//and stored it into a session name to be able to validate
//it in the future
$_SESSION['randomcode'] = md5($randomcode);
//Set up headers
header("Content-type: image/png");
//Finally, let's show up the captcha image generated
imagepng($captchafromimage);
?>

You will need a background PNG image which you can download here (right click -> Save as)

Here is the captcha result :

<?php

print "YOUR IP ADDRESS IS : $_SERVER[REMOTE_ADDR]";
?>

In this php tutorial you will learn how to build a random image banner rotator. Basically, it’s the same as the link rotator, we build a php array with images wanted to rotate, then we’ll apply the rand() php function.

<?php
$banners = array("path/img1.jpg", "path/img2.gif");
$max = sizeof($banners);
$rand = rand(0, $max);
print $banners[$rand];
?>

In this php tutorial you will learn how to build a random link rotator. Basically, we’ll build a php array with the links needed to rotate and then we’ll print to user the link randomly.

<?php
$links = array("link 1", "link 2", "link 3");
$max = sizeof($links);
$rand = rand(0, $max);
print $links[$rand];
?>

Html side is right here :

<form action="" method="POST">
Full name : <input type="text" name="fullname"><br/>
Email : <input type="text" name="email"><br/>
Message : <textarea name="message"></textarea><br/>
<input type="submit" name="sb" id="sb" value="Send">
</form>

And here it is the processing side

if(isset($_POST['submit'])) {

if($_POST['fullname'] == "" || $_POST['email'] == "" || $_POST['message'] == "")
print "Fields are mandatory";
}else{
$to = "youremail";
$from = $_POST['email'];
$subject = "contact form";
$message = $_POST['message'];
mail($to, $subject, $message);
}

In this php tutorial you will learn how to make a file uploader. Less words, and here we are : first we create the html form

<form action="" method="POST" enctype="multipart/form-data">
Browse file to upload <input type="file" name="filetoupload" id="filetoupload"><br/>
<input type="submit" name="sb" id="sb" value="Upload now">
</form>

Now that we have the html form created, I’ve pushed the action on itself. So, no need to create another separate page to process the data.

Here is the php code

<?php

if(isset($_POST['sb'])) {
$path = "yourpath";
$file = $_FILES['filetoupload']['name'];
move_uploaded_file($_FILES['filetoupload']['tmp_name'], "$path/$file");
}
?>

Bulk php file uploader is now done,

Enjoy!

This php function uses the html meta tag and its refresh attribute. I use it because I can easily estabilish how many seconds to wait before refreshing the page : nice, isn’t it?

There is already a php function which refreshes a page, but there isn’t a way to pass the number of seconds needed before refreshes, it’s just refreshes the page when the php engine goes to the line of code.

Here is the function :

<?php
//function to refresh a page in a number of seconds

function refreshPage($destination, $seconds)
{

print "<meta http-equiv=\"refresh\" content=\"$seconds; url=$destination\">";
}
?>

I finded it usefull to build a simple and maximum 10 lines of code php function which can be used in filtering words that you wouldn’t want to appear on your website, forum, guestbook, comments, etc.

The most common way where is to use it within a html form, validating an input, textarea element, etc.

The code is built and commented below :

<?php
//call the special word which builds a new function

//custom php function and give it a nice name
function filterMe($whatToFilter, $listOfUnwantedWords)
{

foreach ($listOfUnwantedWords as $value) {

if (preg_match("/$value/i", "$whatToFilter")) {

print "You have used an unallowed word";
exit();
}
}
}
?>

Usage of this php function to filter unwanted words : firstly, build an php array with unwanted words, then apply the function where you need it. Example :

<?php
//create array with not wanted words

$Unwanted = array("www", "mywebsite", "etc");
//estabilish which given word to filter

$word = $_POST['yourinput'];
//function in action


filterMe($word, $Unwanted);
?>

Feel free to use it anywhere!