<?php $name1 = 'no_gravity'; $name2 = 'n0_gr4v1ty'; function stringDiff($string1, $string2) { $x = str_split($string1); $y = str_split($string2); $diff = array_diff($x, $y); foreach ($diff as $letter) { $string1 = str_replace($letter, '-', $string1); } return $string1; } var_dump(stringDiff($name1, $name2));
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