How to apply content filter permanently?
//run once $allposts = get_posts(‘post_status=publish&numberposts=-1’); foreach ($allposts as $thispost) { wp_update_post( array( ‘ID’ => $thispost->ID, ‘post_content’ => fix_zip_code($thispost->post_content) ) ); } But as Rarst mentioned, backup your database before doing anything…