HTMLify

class Solution {

    /**
     * @param Integer[]
     * @return Integer
     **/
    function singleNumber($nums) {
        $result = 0;
        foreach ($nums as $num) {
            $result ^= $num; 
        }
        return $result;
    }
}

/*class Solution {

    /**
     * @param Integer[] $nums
     * @return Integer
     **
    function singleNumber($nums) {
        $count = array_count_values($nums); 
        foreach ($count as $num => $freq) {
            if ($freq == 1) { 
                return $num;
            }
        }
    }
}*/