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<?php $str = 'a,b\,c'; var_dump(preg_split('/(?<![^\\\\][\\\\]),/', $str));
based on WTQOZ
Output for 4.4.5 - 4.4.9, 5.2.0 - 7.1.0
array(2) { [0]=> string(1) "a" [1]=> string(4) "b\,c" }
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 13 in /in/7VsFj on line 3 bool(false)
Output for 4.3.0 - 4.3.10
Warning: Compilation failed: lookbehind assertion is not fixed length at offset 13 in /in/7VsFj on line 3 bool(false)