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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = [&$a]; function fill (&$a, $i = 3) { if (!$i--) return; foreach ($a as &$tmp) { $tmp = array($tmp ,&$a); //var_dump($a); fill($tmp, $i); } } fill($a);
Output for 5.5.24 - 7.1.0

Process exited with code 139.
Output for 5.4.0 - 5.4.45
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 72 bytes) in /in/t72oY on line 6
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/t72oY on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/t72oY on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/t72oY on line 2
Process exited with code 255.