3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array(&$a); function fill (&$a, $i = 3) { if (!$i--) return; foreach ($a as &$tmp) { $tmp = array($tmp ,&$a); echo '.'; fill($tmp, $i); } } fill($a);
Output for 5.5.35 - 5.5.38, 5.6.21 - 5.6.38, 7.0.6 - 7.0.31, 7.1.0 - 7.1.22, 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
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Process exited with code 137.
preferences:
336.64 ms | 440 KiB | 222 Q