$array1 = array("a" => 1, "b" => 2, "c" => 3, "d" => 4); $array2 = array("e" => 4, "f" => 6, "c" => 7, "d" => 4); $result = array(); foreach ($array1 as $key => $value) { foreach ($array2 as $k => $v) { if ($value == $v) { $result[$key] = $value; } } } -- Find issues in the above code base