3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); phpversion() >= "5.6.0" or die(); $a = [1]; unset($a[0]); var_dump(count($a),$a);
Output for 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0
int(0) array(0) { }
Output for 5.5.24 - 5.5.35

preferences:
82.5 ms | 401 KiB | 46 Q