public function check($app_username, $app_tenant)
	{
		if ($arr = $this->load($app_username, $app_tenant))
		{
			return true;
		}
		
		return false;
	}
public function check($app_username, $app_tenant)
	{
		if ($arr = $this->load($app_username, $app_tenant))
		{
			return true;
		}
		
		return false;
	}
public function check ( $ app_username , $ app_tenant ) { if ( $ arr = $ this -> load ( $ app_username , $ app_tenant ) ) { return true ; } return false ; }
Returns TRUE if an OAuth token exists for this user, FALSE otherwise

@param string $app_username
@return bool
Returns TRUE if an OAuth token exists for this user FALSE otherwise