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Warning: Undefined array key "q3" in /disk2/dm/mardiris/login_with_mysql_and_session/q4.php on line 12

Fatal error: Uncaught mysqli_sql_exception: Incorrect integer value: '' for column `mardiris`.`answers`.`userid` at row 1 in /disk2/dm/mardiris/login_with_mysql_and_session/q4.php:12 Stack trace: #0 /disk2/dm/mardiris/login_with_mysql_and_session/q4.php(12): mysqli_query() #1 {main} thrown in /disk2/dm/mardiris/login_with_mysql_and_session/q4.php on line 12