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<?php $word1 = 'abcdefghijkl'; $word2 = 'acgikluuo'; $expected = 6; function countMatchingChars($word1, $word2) { $matching = 0; foreach(str_split($word1) as $char) { if(strpos($word2, $char) !== false) { $matching++; } } return $matching; } $matchingChars = countMatchingChars($word1, $word2); assert($matchingChars === $expected);
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