thinkphp where to read the database configuration information in the conf/conf.php file, how to handle

thinkphp where to read the database configuration information in the conf/conf.php file
Study the thinkphp framework for a few days, but never find out where to get the database configuration information when the database is instantiated
' Db_type ' = ' mysql ',
' db_host ' = ' localhost ',
' db_name ' = ' examples ',
' Db_user ' = ' root ',
' Db_pwd ' = ' 123456 ',
' Db_port ' = ' 3306 ',
' Db_prefix ' = ' think_ ',
Then, return the database instantiation object

Seeking expert analysis
------Solution--------------------
Instantiate the Think class by invoking the C function in the Think::buildapp method to load
And remains in the C function as a static variable

------Solution--------------------
$user =new Model ("user");//"User" is the database table name
$user =m ("user"); This is a simple way for thinkphp to do so.
$list = $user->select ();
Var_dump ($list);
Configuration is
config.inc.php File and
In the controller
$arrr =array (
' DBMS ' = ' mysqli ',//Note that the key names in this book group are not subject to change.
' username ' = ' Google ',
' Password ' = ' Hello ',
' Hostname ' = ' 127.0.0.1 ',
' Database ' = ' mydbname ',
);
$DB =new db ($ARRR);

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