3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string='bla bla xxx bla *xxx bla bla **xxx bla bla ***xxx bla bla ****xxx'; $search='xxx'; $char='*'; $string = preg_replace_callback( '/(' . preg_quote($char) . '*)(' . $search . ')/', function($matches) { global $char; if(strlen($matches[1]) % 2 === 0) { return $matches[1] . $char . $matches[2]; } else { return $matches[0]; } }, $string ); print $string;
Output for git.master, git.master_jit, rfc.property-hooks
bla bla *xxx bla *xxx bla bla ***xxx bla bla ***xxx bla bla *****xxx

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
167.86 ms | 405 KiB | 5 Q