How to check if one array elements entirely exists in another array in php [duplicate]

Answer 1

Try:

$fullyExists = (count($array2) == count(array_intersect($array2, $array1));

The array_intersect.php function will return only elements of the second array that are present in all the other arguments (only the first array in this case). So, if the length of the intersection is equal to the lenght of the second array, the second array is fully contained by the first one.