Teach me how to program

sorry still new.  I still lots to learn.

Another error that I do not understand.


--------------------
A PHP Error was encountered

Severity: Notice

Message: Only variable references should be returned by reference

Filename: core/Common.php

Line Number: 257
A PHP Error was encountered

Severity: Warning

Message: require_once(C:/xampp/htdocs/gsa/system/database/drivers/mysqli_connect/mysqli_connect_driver.php): failed to open stream: No such file or directory

Filename: database/DB.php

Line Number: 140

Fatal error: require_once(): Failed opening required 'C:/xampp/htdocs/gsa/system/database/drivers/mysqli_connect/mysqli_connect_driver.php' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\gsa\system\database\DB.php on line 140


database.php

PHP Code:

$db['default'] = array(
'dsn' => '',
'hostname' => 'localhost',
'username' => 'gsaconst_admin',
'password' => '',
'database' => 'gsaconst_database',
'dbdriver' => 'mysqli',
'dbprefix' => 'pix_',
'pconnect' => TRUE,
'db_debug' => (ENVIRONMENT !== 'production'),
'cache_on' => FALSE,
'cachedir' => '',
'char_set' => 'utf8',
'dbcollat' => 'utf8_general_ci',
'swap_pre' => '',
'encrypt' => FALSE,
'compress' => FALSE,
'stricton' => FALSE,
'failover' => array(),
'save_queries' => TRUE
); 


" If I looks more intelligence please increase my reputation."