Added solution in PHP language

[sarvar-akbarov]

class Solution {

    /**
     * @param Integer[] $nums
     * @return Integer[]
     */
    function leftRightDifference($nums) {
        $left = 0;
        $rightWithNum = array_sum($nums);

        foreach($nums as $key => $num){
            $nums[$key] = abs($left - ($rightWithNum - $num));
            $left += $num;
            $rightWithNum -= $num;
        }
        return $nums;
    }
}

[sarvar-akbarov]

pythonda berilgan yechimda left bilan right ni nomlanishi almashib qolmaganmi?