Test if one array is a subset of another

Question

How can I determine if one array is a subset of another (all elements in the first are present in the second)?

 $s1 = \"string1>string2>string3>string4&         


        

Answer 1

Simple function which will return true if array is exact subset otherwise false. Solution is applicable for two dimensional array as well.

 function is_array_subset($superArr, $subArr) {
        foreach ($subArr as $key => $value) {
            //check if keys not set in super array OR values are unequal in both array.
            if (!isset($superArr[$key]) || $superArr[$key] != $value) {
                return false;
            }
        }
        return true;
    }