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<?php preg_match_all("/.{1}/", "123456", $out); var_dump($out);
Output for 4.3.0 - 7.2.0
array(1) { [0]=> array(6) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" [5]=> string(1) "6" } }