Given an array of integers nums.

A pair (i,j) is called good if nums[i] == nums[j] and i < j.

Return the number of good pairs.

class Solution {

    /**
     * @param Integer[] $nums
     * @return Integer
     */
    function numIdenticalPairs($nums) {
        $ans = 0;
        for($i = 0; $i < count($nums) - 1 ; $i++){
            for($j = $i+1 ; $j < count($nums);$j++){
                if ($nums[$i] === $nums[$j]){
                    $ans++;
                }
            }
        }   
        return $ans;
    }
}