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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('/((?=[^\\\]\\\)|\G),/', $str));
based on ud6bW
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(1) { [0]=> string(10) "a\\,b,c\,d" }