身分證校驗碼的計算

原来我的ID最后一位X其实是2了。

    public function id_verify($my_id) {

        $coefficient = array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2);

        $remainder_map = array(1,0,'X',9,8,7,6,5,4,3,2);

        $count = 0;

        for ($i=0; $i < 17; $i  ) {

            $count  = $my_id[$i] * $coefficient[$i];
        }

        $remainder = $count % 11;

        if ($my_id[17] == $remainder_map[$remainder]){

            echo 'true';
        }else{

            echo 'false';
        }
    }