3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $num = "\x17\x23"; $bigEndian = unpack("v", $num); echo $bigEndian[0];
Output for 5.3.0 - 7.1.7
Notice: Undefined offset: 0 in /in/0PLgC on line 4
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 0 in /in/0PLgC on line 4