Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\phpstudy_pro\WWW\4006lt\e\class\connect.php:98 Stack trace: #0 C:\phpstudy_pro\WWW\4006lt\e\public\DownFile\index.php(5): db_connect() #1 {main} thrown in C:\phpstudy_pro\WWW\4006lt\e\class\connect.php on line 98