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<?php $str = 'a\\\\,b,c\\,d'; var_dump(preg_split('/(?<![^\x5c][\x5c]),/', $str));
based on PO8qp
Output for 4.4.5 - 4.4.9, 5.2.0 - 7.1.0
array(3) { [0]=> string(3) "a\\" [1]=> string(1) "b" [2]=> string(4) "c\,d" }
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 17 in /in/IYTVe on line 3 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 17 in /in/IYTVe on line 3 bool(false)