WordPress - Admin search meta to

<?php/*Plugin Name: Admin SearchMetaToPlugin URI: http://www.t31os.co.cc/Description: Extends the posts management search to also check against meta data.Author: t31osVersion: 1.0Author URI: http://www.t31os.co.cc/*/class post_searches_meta {		function post_searches_meta() {		add_filter( 'posts_where' , array( $this , 'where' ) );		add_filter( 'posts_join' , array( $this , 'join' ) );		add_filter( 'posts_groupby' , array( $this , 'group' ) );	}	function group( $groupby ) {		global $wp_query, $wpdb;		if( !is_admin() || !$wp_query->query_vars['s'] )			return $groupby;		// we need to group on post ID		$mygroupby = "{$wpdb->posts}.ID";		if( preg_match( "/$mygroupby/", $groupby )) {			// grouping we need is already there			return $groupby;		}		if( !strlen(trim($groupby))) {			// groupby was empty, use ours			return $mygroupby;		}		// wasn't empty, append ours		return $groupby . ", " . $mygroupby;	}	function where( $where ) {		global $wp_query, $wpdb;				if( !is_admin() || !$wp_query->query_vars['s'] )			return $where;				$s = $wp_query->query_vars['s'];				if( 		// If the where string contains what i'm looking for		strpos( $where , 'AND (((' ) != false && 		// Make sure there's no other matches in the string		strpos( substr( $where , 10 ) , 'AND (((' ) == false ) 		{				// Was either strpos and str_replace or preg_*** functions, which are heavier ...			$where = str_replace( 'AND (((' , "AND ((({$wpdb->postmeta}.meta_key LIKE '%$s%') OR ({$wpdb->postmeta}.meta_value LIKE '%$s%') OR (" , $where );		}		return $where;	}	function join( $join ) {		global $wp_query, $wpdb;		if( is_admin() && isset( $wp_query->query_vars['s'] ) ) {			$join .= " LEFT JOIN " . $wpdb->postmeta . " ON " . $wpdb->posts . ".ID = " . $wpdb->postmeta . ".post_id ";		}		return $join;	}}$post_searches_meta = new post_searches_meta();?>