3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s1 = "_target"; $a1 = [0 => ""]; var_dump(array_push($a1, $s1));
Output for 5.6.0 - 5.6.25, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
int(2)
preferences:
178.64 ms | 404 KiB | 216 Q