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run code in 150+ php & hhvm versions
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<?php function splitallowescape($str) { preg_match_all('/(?:[^\x5c,]|\x5c(?:.|$))+/', $str, $matches); foreach($matches[0] as $key => $match) { $matches[0][$key] = str_replace(array("\\\\"),array("\\"),$match); } return $matches[0]; } var_dump(splitallowescape("a,b")) ?>
based on iuqkH
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(1) "a" [1]=> string(1) "b" }