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run code in 200+ php & hhvm versions
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<?php $a = '5m'; $p = str_split($a); var_dump(array_values($p));
based on W2BfC
Output for 5.6.0 - 7.3.0beta1
array(2) { [0]=> string(1) "5" [1]=> string(1) "m" }