3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a,b,c,d'; var_dump(preg_split('/(?<!(\\\\{2})+\\\\),/', $str));
based on GYvm3
Output for 5.3.19 - 5.3.29, 5.4.9 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_split(): Compilation failed: lookbehind assertion is not fixed length at offset 14 in /in/UpsgS on line 3 bool(false)
Output for hhvm-3.12.0
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 14 in /in/UpsgS on line 3 bool(false)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.3.18, 5.4.0 - 5.4.8
array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" }