let arr1 = [0, 1, 2]; let arr2 = [3, 5, 7]; let primes = arr1.concat(arr2); // > [0, 1, 2, 3, 5, 7]
$array1 = [1, 2]; $array2 = [2, 3, 4]; $commonValue = array_intersect($array1, $array2); //$commonValue = 2 // If you have X number of arrays you can do: $array1 = [1, 2]; $array2 = [2, 3, 4]; $arrayOfArrays = [$array1, $array2]; $commonValue = array_intersect(...$arrayOfArrays);