Warning: include_once(mysqli/mysql2i.class.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\comzone\donate\connect.php on line 3

Warning: include_once(): Failed opening 'mysqli/mysql2i.class.php' for inclusion (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\comzone\donate\connect.php on line 3

Fatal error: Uncaught Error: Undefined constant "host" in C:\xampp\htdocs\comzone\donate\paypal_integration_class\paypal.class.php:162 Stack trace: #0 C:\xampp\htdocs\comzone\donate\ipn.php(9): paypal_class->validate_ipn() #1 {main} thrown in C:\xampp\htdocs\comzone\donate\paypal_integration_class\paypal.class.php on line 162