3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a,b\,c,d'; var_dump(preg_split('/(?<!\x5c)(?:\x5c.)*\K,/s', $str));
based on AU2RP
Output for 4.4.9, 5.2.4 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(3) { [0]=> string(1) "a" [1]=> string(4) "b\,c" [2]=> string(1) "d" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.3
array(1) { [0]=> string(8) "a,b\,c,d" }