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run code in 150+ php & hhvm versions
Bugs & Features
<?php print_r(unpack("I", pack("I", -1)));
Output for 5.3.14 - 5.3.29, 5.4.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => 4294967295 )
Output for 5.3.7 - 5.3.13, 5.4.0 - 5.4.3
Array ( [1] => -1 )