3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = 'The sky is blue'; echo preg_replace_callback( '/(?:[^a-z]*\K[a-z]){4}/i', fn($m) => $m[0] ^ ' ', $string );
Output for git.master, git.master_jit, rfc.property-hooks
The Sky iS bluE

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:
74.46 ms | 405 KiB | 5 Q