3v4l.org

run code in 200+ php & hhvm versions
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<?php $pin = '1234'; $digits = str_split($pin); var_dump($digits); $pin = '2345'; var_dump($digits);
based on bDDg4
Output for 5.6.0 - 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.0 - 7.3.0beta1
array(4) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" } array(4) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" }