3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $str = 'a\\\\,b,c\\,d'; preg_match_all('/[^\\\\]\\\\,|([^,]+?)/', $str, $matches); print_r(array_filter($matches[1]));
based on AtJWb
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [0] => a [1] => \ [2] => \ [3] => b [5] => d )