3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = "hello"; $b = "hi"; $val = "a"; echo $$val; // outputs "hello" echo "\n"; $val = "b"; echo $$val; // outputs "hi"

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Output for branch master
hello hi

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