Fatal error: Uncaught TypeError: extract(): Argument #1 ($array) must be of type array, bool given in C:\phpstudy\ypgfj\app\system\include\class\common.class.php:91 Stack trace: #0 C:\phpstudy\ypgfj\app\system\include\class\common.class.php(91): extract() #1 C:\phpstudy\ypgfj\app\system\include\class\common.class.php(49): common->load_mysql() #2 C:\phpstudy\ypgfj\app\system\include\class\web.class.php(23): common->__construct() #3 C:\phpstudy\ypgfj\app\app\shop\web\class\web_shop_base.class.php(18): web->__construct() #4 C:\phpstudy\ypgfj\app\app\shop\web\cart.class.php(17): web_shop_base->__construct() #5 C:\phpstudy\ypgfj\app\system\include\class\load.class.php(293): cart->__construct() #6 C:\phpstudy\ypgfj\app\system\include\class\load.class.php(168): load::_load_class() #7 C:\phpstudy\ypgfj\app\system\entrance.php(94): load::module() #8 C:\phpstudy\ypgfj\shop\cart.php(8): require_once('...') #9 {main} thrown in C:\phpstudy\ypgfj\app\system\include\class\common.class.php on line 91