3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array1 = array(1); //$x = &$array1[1]; //$array2 = $array1; //$array2[1] = 22; //echo $array1[1];
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.21, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
preferences:
186.93 ms | 404 KiB | 227 Q