WordPress: Replace Viper's quick tags (youtube, vimeoh, veoh, viddler) with the native video shortcode.

WordPress: Replace viper's quick tags with the native video shortcode

<?php
/**
 * Plugin Name: Replace Viper's Video Quicktags
 * Description: Replace Viper's video quicktags (youtube, vimeo, viddler, veoh) with the native video tag [video src="..."]
 * Author:      birgire
 * Author URI:  https://gist.github.com/birgire
 * Plugin URI:  https://gist.github.com/birgire/05300dee75b62fab795b
 * Version:     0.0.3
 *
 * Examples:
 *     Old:
 *         [veoh width="340" height="438"]http://www.veoh.com/videos/v14185855NK3BNfQa[/veoh]
 *     New:
 *         [video src="http://www.veoh.com/videos/v14185855NK3BNfQa"]
 *
 *     Old:
 *         [youtube]http://www.youtube.com/watch?v=Mn4_40hAAr0[/youtube]
 *     New: 
 *         [video src="http://www.youtube.com/watch?v=Mn4_40hAAr0"]
 *
 * Install:
 *     Create the file 'vipers_replacer.php' in your plugin directory and activate it.
 *
 * Usage:
 *    - Modify the plugin settings (i.e. posts_per_page, offset, post_type, vipers quick tags).
 *    - Reload the frontpage once. 
 *    - Check the messages in the frontpage's footer.
 *    - Deactivate the plugin.
 *
 */
 
add_action( 'wp_footer', function(){

	// Only for admins:
	if ( ! current_user_can( 'manage_options' ) ) 
		return; 

	//--------------------
	// EDIT to your needs:
	$posts_to_fetch    = 50; 
	$offset            = 0; 
	$post_type         = array( 'post' );
	$vipers_quick_tags = array( 'youtube', 'vimeo', 'viddler', 'veoh' );
	//--------------------
	
	// Fetch posts:
	$posts = get_posts( array( 'posts_per_page' => $posts_to_fetch, 'offset' => $offset, 'post_type' => $post_type  ) );
	
	// Regex setup:
	$s = join( '|', $vipers_quick_tags ); 
	$pattern     = "/\[(" . $s . ")[^\]]*\](.*)?\[\/(" . $s . ")\]/i";
	$replacement = "[video src=\"$2\"]";

	// Loop:
	print( '<h1>RegEx Updates:</h1><pre>' );
	foreach( $posts as $post )
	{
		// Setup:
		$title 	    = $post->post_title;
		$content    = $post->post_content;
		$pid        = $post->ID;
		
		// RegEx replace:
		$content = preg_replace( $pattern, $replacement, $content );

		// Only update the current post if the replace had any effect:
		if( $content !== $post->content && ! empty( $content ) ):
		
			// Update current post:
			if( 0 == wp_update_post( array( 'ID' => $pid, 'post_content' => $content ) ) )
				$updated = 'no';
			else
				$updated = 'yes';

			// Show results:
			printf( "<hr /> Post: %s - ID: %d - %s",
				$title,
				$pid,
				( 'yes' === $updated ) ? 'Succesfully updated!' : 'Error when trying to update!' 
			);		

		endif;
		
	}
	print( '</pre>' );

});