A Database Error Occurred - codeigniter -

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i got error :

unable connect database server using provided settings.  filename: c:/xampp/htdocs/soheil/system/database/db_driver.php  line number: 436

but when add below code inside database.php prints ok :

echo '<pre>'; print_r($db['default']); echo '</pre>';  echo 'connecting database: ' .$db['default']['database']; $dbh=mysql_connect (     $db['default']['hostname'],     $db['default']['username'],     $db['default']['password']) or die('cannot connect database because: ' . mysql_error()); mysql_select_db ($db['default']['database']);  echo '<br />   connected ok:'  ; die( 'file: ' .__file__ . ' line: ' .__line__);

my config :

$db['default'] = array(     'dsn'   => '',     'hostname' => 'localhost',     'username' => '',     'password' => '',     'database' => 'soheil',     'dbdriver' => 'mysqli',     'dbprefix' => '',     'pconnect' => false,     '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 );

are put username on database? maybe root user

$db['default'] = array(     'dsn'   => '',     'hostname' => 'localhost',     'username' => 'root',     'password' => '',     'database' => 'soheil',     'dbdriver' => 'mysqli',     'dbprefix' => '',     'pconnect' => false,     '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 );

hope help.


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