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run code in 150+ php & hhvm versions
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<?php $str = 'a\\,b,c\,d'; var_dump(preg_split('/(?<!(?<=\\\\)\\\\),/', $str));
based on aff9M
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(2) "a\" [1]=> string(1) "b" [2]=> string(2) "c\" [3]=> string(1) "d" }
Output for hhvm-3.10.0

Process exited with code 153.