PMA\libraries\dbi\DBIExtension::connect PHP Method

    public function connect($user, $password, $server);

 /**
  * connects to the database server
  *
  * @param string $user                 user name
  * @param string $password             user password
  * @param bool   $is_controluser       whether this is a control user connection
  * @param array  $server               host/port/socket/persistent
  * @param bool   $auxiliary_connection (when true, don't go back to login if
  *                                     connection fails)
  *
  * @return mixed false on error or a connection object on success
  */
 public function connect($user, $password, $is_controluser = false, $server = null, $auxiliary_connection = false)
 {
     $error_count = $GLOBALS['error_handler']->countErrors();
     $result = $this->_extension->connect($user, $password, $is_controluser, $server, $auxiliary_connection);
     /* Any errors from connection? */
     if ($GLOBALS['error_handler']->countErrors() > $error_count) {
         $errors = $GLOBALS['error_handler']->sliceErrors($error_count);
         foreach ($errors as $error) {
             trigger_error($error->getMessage(), E_USER_ERROR);
         }
     }
     if ($result) {
         if (!$auxiliary_connection && !$is_controluser) {
             $GLOBALS['dbi']->postConnect($result);
         }
         return $result;
     }
     if ($is_controluser) {
         trigger_error(__('Connection for controluser as defined in your ' . 'configuration failed.'), E_USER_WARNING);
         return false;
     }
     // Do not go back to main login if connection failed
     // (currently used only in unit testing)
     if ($auxiliary_connection) {
         return false;
     }
     PMA_logUser($user, 'mysql-denied');
     $GLOBALS['auth_plugin']->authFails();
     return $result;
 }