1let arr1 = [0, 1, 2];
2let arr2 = [3, 5, 7];
3let primes = arr1.concat(arr2);
4
5// > [0, 1, 2, 3, 5, 7]
1$array1 = [1, 2];
2$array2 = [2, 3, 4];
3$commonValue = array_intersect($array1, $array2);
4//$commonValue = 2
5// If you have X number of arrays you can do:
6$array1 = [1, 2];
7$array2 = [2, 3, 4];
8$arrayOfArrays = [$array1, $array2];
9$commonValue = array_intersect(...$arrayOfArrays);