3v4l.org

run code in 300+ PHP versions simultaneously
<?php $number = 1; $answer = "p__vä"; $letter = mb_substr( $answer , 2, 1 ); $answer = preg_replace('/'.$letter.'/u', '_',$answer,1); echo $answer;
Output for git.master, git.master_jit, rfc.property-hooks
p__vä

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:
58.4 ms | 401 KiB | 8 Q