Online PHP editor | refs for PPbUW

<?php $file = '/css/base.css'; $mtime = 1221534296; echo "Yours: " , preg_replace('{\\.([^./]+)$}', ".$mtime.\$1", $file); echo "\n---\nMine: " , preg_replace('~(?=[^./]+$)~', "$mtime.", $file, 1); echo "\n---\nOr: " , preg_replace('~\.\K(?=[^./]+$)~', "$mtime.", $file); echo "\n---\nOr: " , preg_replace('~(?=\.[^./]+$)~', ".$mtime", $file);