3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [1, [2, 3]]; $array[1][1] = &$array; count($array, COUNT_RECURSIVE);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
Warning: count(): Recursion detected in /in/DlrWH on line 5
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: count(): recursion detected in /in/DlrWH on line 5
preferences:
61.35 ms | 407 KiB | 5 Q