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<?php $array1 = ["a" => 2, "b" => 3, "c" => 1, "d" => 2]; $array2 = ["c" => 1, "d" => 1, "a" => 2, "b" => 3, "x" => 4, "z" => 1]; $count = 0; foreach($array1 as $key => $value){ $array_2_value = $array2[$key] ?? null; if($array_2_value !== null && $array_2_value === $value) $count++; } echo $count;