Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, bool given in /www/yyw.com/app/class/php7DB.php:41 Stack trace: #0 /www/yyw.com/app/class/php7DB.php(41): mysqli_query() #1 /www/yyw.com/app/class/DB.php(65): mysql_query() #2 /www/yyw.com/app/inc/function.php(876): DB->connect() #3 /www/yyw.com/app/sortList.php(51): selectDbCon() #4 /www/yyw.com/sortList.php(34): include('...') #5 {main} thrown in /www/yyw.com/app/class/php7DB.php on line 41