3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = []; $arr = &$arr; var_dump(count($arr, COUNT_RECURSIVE));
Output for 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 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
int(0)
preferences:
109.3 ms | 403 KiB | 141 Q