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run code in 150+ php & hhvm versions
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<?php const xxx=4.3; $a = array(&$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 5.4.0 - 7.1.0

Process exited with code 139.
Output for 5.3.0 - 5.3.29
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71 bytes) in /in/deZC6 on line 8
Process exited with code 255.
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_CONST in /in/deZC6 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_CONST in <b>/in/deZC6</b> on line <b>2</b><br />
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
<br /> <b>Parse error</b>: parse error, unexpected T_CONST in <b>/in/deZC6</b> on line <b>2</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/deZC6</b> on line <b>2</b><br />
Process exited with code 255.