3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $conversion = pack ("H", 255); $conv = unpack("H", $conversion); echo $conv{1};
Output for 4.4.2 - 4.4.9, 5.1.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
2
Output for 4.3.5 - 4.4.1, 5.0.0 - 5.1.1
Output for 4.3.0 - 4.3.4
Notice: Undefined offset: 1 in /in/DniOk on line 5