.. _Convert-toLanguageId:

==============================================
Convert::toLanguageId()
==============================================

\\nn\\t3::Convert()->toLanguageId(``$languageCode = NULL``);
----------------------------------------------

Converts a two-character language abbreviation (e.g. 'de', 'en')
into the language ID (e.g. '0', '1')

.. code-block:: php

	// Language ID 0 -> 'de'
	\nn\t3::Convert('de')->toLanguageId();

| ``@param int $sysLanguageUid``
| ``@return string``

Source Code
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. code-block:: php

   
   public function toLanguageId($languageCode = null)
   {
   	if (is_numeric($languageCode)) {
   		return $languageCode;
   	}
   	$key = $languageCode !== null ? $languageCode : $this->initialArgument;
   	$languages = \nn\t3::Environment()->getLanguages('iso-639-1', 'languageId');
   	return $languages[$key] ?? '';
   }