Notice: Undefined variable: security in C:\xampp\htdocs\login.php on line 1

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp\htdocs\config\connection.php:14 Stack trace: #0 C:\xampp\htdocs\login.php(1): include_once() #1 {main} thrown in C:\xampp\htdocs\config\connection.php on line 14