3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = array(1=>"test",2=>"test2"); $array[1]=&$array[2]; print_r($array);
Output for 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 - 8.2.18, 8.3.0 - 8.3.7
Array ( [1] => test2 [2] => test2 )
preferences:
172.03 ms | 404 KiB | 217 Q