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run code in 200+ php & hhvm versions
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<?php $str = 'a,b\,c,d'; var_dump(preg_split('/(?:[^\x5c]|\A)(?:\x5c.)*\K,/s', $str));
based on WsOFd
Output for 4.4.9, 5.2.4 - 7.1.7
array(3) { [0]=> string(1) "a" [1]=> string(4) "b\,c" [2]=> string(1) "d" }
Output for 4.3.0 - 4.4.8, 5.0.0 - 5.2.3
array(1) { [0]=> string(8) "a,b\,c,d" }