Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\test\shop\includes\database\mysql.php:13 Stack trace: #0 C:\xampp\htdocs\test\shop\index.php(54): db_connect('localhost', '', '') #1 {main} thrown in C:\xampp\htdocs\test\shop\includes\database\mysql.php on line 13