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run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a\\\\,b,c\\,d'; var_dump(preg_split('/(?<=[^\\\]\\\,)/', $str));
based on 9YYO6
Output for 4.4.5 - 4.4.9, 5.2.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(9) "a\\,b,c\," [1]=> string(1) "d" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 4.4.4, 5.0.0 - 5.1.6
Warning: preg_split(): Compilation failed: lookbehind assertion is not fixed length at offset 12 in /in/D05sS on line 3 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 12 in /in/D05sS on line 3 bool(false)