3v4l.org

run code in 500+ PHP versions simultaneously
<?php function getData() { $a[0] = &$a; return $a; } function recurcive(&$data) { $data[] = 'X'; if (end($data[0]) !== 'X') { recurcive($data[0]); } } $data = getData(); recurcive($data);
Output for 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 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3

preferences:
112.13 ms | 1609 KiB | 4 Q