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run code in 200+ php & hhvm versions
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<?php $a = array(&$a); function fill (&$a, $i = 3) { if (!$i--) return; foreach ($a as &$tmp) { $tmp = array(&$tmp ,&$a); fill($tmp, $i); } } fill($a);
Output for 7.0.20 - 7.2.0

Process exited with code 137.