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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('/(?<!(\\\\{2})\\\\),/', $str));
based on SNZA0
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(4) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "c" [3]=> string(1) "d" }