Question

In PHP, the in_array() function only allows for checking the presence of a single value.

How do I check for multiple values at the same time?

Please provide the answer for both cases:

1. Checking if all values are present in the array
2. Checking if at least one value is present in the array

Answer 1

Intersect the targets with the haystack and make sure the intersection count is equal to the target’s count:

$haystack = array(...);

$target = array('foo', 'bar');

if(count(array_intersect($haystack, $target)) == count($target)){
    // all of $target is in $haystack
}

Note that you only need to verify the size of the resulting intersection is the same size as the array of target values to say that $haystack is a superset of $target.

To verify that at least one value in $target is also in $haystack, you can do this check:

 if(count(array_intersect($haystack, $target)) > 0){
     // at least one of $target is in $haystack
 }