/**
* check if value in the given attribute is a valid language code
* return true if valid, otherwise, return false
*/
public static function isValidLangCode($code)
{
// The allowed characters in a valid language code are letters, numbers or dash(-).
if (!preg_match("/^[a-zA-Z0-9-]+\$/", $code)) {
return false;
}
$code = BasicChecks::cutOutLangCode($code);
$langCodesDAO = new LangCodesDAO();
if (strlen($code) == 2) {
$rows = $langCodesDAO->GetLangCodeBy2LetterCode($code);
} else {
if (strlen($code) == 3) {
$rows = $langCodesDAO->GetLangCodeBy3LetterCode($code);
} else {
return false;
}
}
return is_array($rows);
}
/**
* Return a valid 3-character language code
* 1. if input is a valid 3-character language code, return itself;
* 2. if input is a valid 2-character language code, return according 3-character language code
* 3. if input is an invalid language code, return default language code
*/
public static function get3LetterLangCode($code)
{
require_once TR_INCLUDE_PATH . 'classes/DAO/LangCodesDAO.class.php';
$langCodesDAO = new LangCodesDAO();
if (!Utility::isValidLangCode($code)) {
return $_config['default_language'];
} else {
if (strlen($code) == 3) {
return $code;
}
if (strlen($code) == 2) {
$rows = $langCodesDAO->GetLangCodeBy2LetterCode($code);
return $rows[0]['code_3letters'];
}
}
}