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run code in 150+ php & hhvm versions
Bugs & Features
<?php $n = unpack('N', md5('className'.'2025', true)); var_dump($n);
Output for 5.0.0 - 5.2.0, 5.2.10 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> int(3792383667) }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.1 - 5.2.9
array(1) { [1]=> int(-502583629) }
Output for 4.3.2 - 4.4.9
Warning: Wrong parameter count for md5() in /in/FPpat on line 2 Warning: unpack(): Type N: not enough input, need 4, have 0 in /in/FPpat on line 2 bool(false)
Output for 4.3.1
Warning: Wrong parameter count for md5() in /in/FPpat on line 2 Warning: unpack() [http://www.php.net/function.unpack]: Type N: not enough input, need 4, have 0 in /in/FPpat on line 2 bool(false)
Output for 4.3.0
Warning: Wrong parameter count for md5() in /in/knH5h on line 2 Warning: unpack() [http://www.php.net/function.unpack]: Type N: not enough input, need 4, have 0 in /in/knH5h on line 2 bool(false)