3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $f='x'; $r1=function_exists('x'); $r2=function_exists($f); var_dump($r1); var_dump($r2);
based on uVV5f
Output for 4.3.0 - 7.2.0
bool(false) bool(false)