Hàm xử lý mãng

Link: https://topdev.vn/blog/su-dung-mang-php-dung-cach/

$array1 = [1, 2, 3, 4];

$array2 = [3, 4, 5, 6];

$diff = array_diff($array1, $array2);

print_r($diff); // [0 => 1, 1 => 2]

$intersect = array_intersect($array1, $array2);

print_r($intersect);  // [2 => 3, 3 => 4]