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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")) ?>
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> string(1) "a" [1]=> string(1) "b" }

preferences:
277.35 ms | 406 KiB | 384 Q