<?php function commonCharacterCount($s1, $s2) { $a1 = str_split($s1); $a2 = str_split($s2); $common = array_intersect($a1, $a2); var_dump($a1, $a2); return count($common); } var_dump(str_split("aabcc")); // var_dump(commonCharacterCount("aabcc", "adcaa"));
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