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run code in 150+ php & hhvm versions
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<?php $a = array('call_user_func_array', &$a); $a[0]($a[0], $a);
Output for 4.3.0 - 5.4.35, 5.4.38 - 7.1.0

Process exited with code 139.
Output for 5.4.36 - 5.4.37

Process exited with code 135.