/**
* Checks if string field value is a valid language code.
*
* @param string $fieldName The name of the property to be checked
* @param boolean $onlyInstalled Whether to accept only installed languages (default false)
* @return boolean result of this check
*/
public function isValidLanguage($fieldName, $onlyInstalled = false)
{
$languageMap = ZLanguage::languagemap();
$result = in_array($this->entity[$fieldName], array_keys($languageMap));
if (!$result || !$onlyInstalled) {
return $result;
}
$available = ZLanguage::getInstalledLanguages();
return in_array($this->entity[$fieldName], $available);
}
