code: public static function triggerImportUserHook($username, $password, $strTable)
  	{
  		$self = new static();
  
  		if (empty($GLOBALS['TL_HOOKS']['importUser']) || !\is_array($GLOBALS['TL_HOOKS']['importUser']))
  		{
  			return false;
  		}
  
  		@trigger_error('Using the "importUser" hook has been deprecated and will no longer work in Contao 5.0. Use the contao.import_user event instead.', E_USER_DEPRECATED);
  
  		foreach ($GLOBALS['TL_HOOKS']['importUser'] as $callback)
  		{
  			$self->import($callback[0], 'objImport', true);
  			$blnLoaded = $self->objImport->{$callback[1]}($username, $password, $strTable);
  
  			// Load successfull
  			if ($blnLoaded === true)
  			{
  				return true;
  			}
  		}
  
  		return false;
  	}
docs: Trigger the importUser hook
  
  @param $username
  @param $password
  @param $strTable
  
  @return bool|static