function nofollow_cat_posts($text) {
global $post;
        if( in_category(1) ) { // SET CATEGORY ID HERE
                $text = stripslashes(wp_rel_nofollow($text));
        }
        return $text;
}
add_filter('the_content', 'nofollow_cat_posts');

Thanks to Sagive for submitting this function!

<?php

  function rkv_url_spamcheck( $approved , $commentdata ) {
    return ( strlen( $commentdata['comment_author_url'] ) > 50 ) ? 'spam' : $approved;
  }

  add_filter( 'pre_comment_approved', 'rkv_url_spamcheck', 99, 2 );

?>

Thanks to CSS Tricks for the code snippet!

The Internet is one huge swap meet. So many sites "borrow" code or plugins from other sites to make their own that much better. And then someone else borrows from their site, and so on. Keeping up with the latest and greatest Web features is an exhausting experience, though. You can check out tons of forums, blogs, newsletters and more just to read up on the latest releases. You can also pay a ton of money to various online services to pull in stats and suggestions.

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Here is a video demo of Spybar in action:

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function prefix_enqueue_custom_script(){
	wp_register_script( 'prefix_custom_script', plugin_dir_url( __FILE__ ) .'js/custom-script.js', array( 'jquery' ) );
        wp_enqueue_script( 'prefix_custom_script' );
        wp_localize_script( 'prefix_custom_script', 'prefix_object_name', array(
		'upload' => __( 'upload', 'textdomain' ),
		'remove' => __( 'remove', 'textdomain' )
	) );
}

Thanks to Devin for this code!

add_filter('upload_mimes', 'my_upload_mimes');
 
function my_upload_mimes($mimes = array()) {
    $mimes['svg'] = 'image/svg+xml';
    return $mimes;
}

Thanks to dbushell for the snippet!

function myplugin_activate() {
    
    $upload = wp_upload_dir();
    $upload_dir = $upload['basedir'];
    $upload_dir = $upload_dir . '/mypluginfiles';
    if (! is_dir($upload_dir)) {
       mkdir( $upload_dir, 0700 );
    }
}
 
register_activation_hook( __FILE__, 'myplugin_activate' );

Thanks to Jean Galea for the snippet!

<?php
	function author_excerpt (){	                     					
		$word_limit = 20; // Limit the number of words
		$more_txt = 'read more about:'; // The read more text
		$txt_end = '...'; // Display text end 
		$authorName = get_the_author();
		$authorUrl = get_author_posts_url( get_the_author_meta('ID'));
		$authorDescription = explode(" ", get_the_author_meta('description'));
		$displayAuthorPageLink = count($authorDescription) > $word_limit ? $txt_end.'<br /> '.$more_txt.' <a href="'.$authorUrl.'">'.$authorName.'</a>' : '' ;
		$authorDescriptionShort = array_slice($authorDescription, 0, ($word_limit));
		return (implode($authorDescriptionShort, ' ')).$displayAuthorPageLink; 		
	}
?>

Once done, simply call the function when needed, as shown below:

<?php  if (function_exists('author_excerpt')){echo author_excerpt();} ?>

Thanks to Tim Marcher for the tip!

$cpage = get_query_var( 'cpage' );
if ( is_singular() && $cpage > 0 ){
    // Your code here
}

This code works on posts, pages, attachments as well as all custom post_types.

Thanks to Daniel Roch for the cool tip!

// Break Out of Frames for WordPress
function break_out_of_frames() {
	if (!is_preview()) {
		echo "\n<script type=\"text/javascript\">";
		echo "\n<!--";
		echo "\nif (parent.frames.length > 0) { parent.location.href = location.href; }";
		echo "\n-->";
		echo "\n</script>\n\n";
	}
}
add_action('wp_head', 'break_out_of_frames');

Thanks to WP Mix for this very handy tip!

add_action('template_redirect', 'redirect_single_post');
function redirect_single_post() {
    if (is_search()) {
        global $wp_query;
        if ($wp_query->post_count == 1) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
        }
    }
}

Thanks to Paulund.co.uk for the snippet!