3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = 'gehr'; function foo($x) { return $x('gehr') === 'true'; } echo foo($x);
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.16, 8.4.1 - 8.4.3
Fatal error: Uncaught Error: Call to undefined function gehr() in /in/8udbi:8 Stack trace: #0 /in/8udbi(11): foo('gehr') #1 {main} thrown in /in/8udbi on line 8
Process exited with code 255.

preferences:
128 ms | 408 KiB | 5 Q