正解は「
Notice: Undefined variable: pref_quiz in /var/www/html/quiz_result.php on line 196
Notice: Trying to access array offset on value of type null in /var/www/html/quiz_result.php on line 196
」
解説：
Notice: Undefined variable: pref_quiz in /var/www/html/quiz_result.php on line 196
Notice: Trying to access array offset on value of type null in /var/www/html/quiz_result.php on line 196
