public static function isValidRTL()
{
global $global_e;
if (isset($global_e->attr["lang"])) {
$lang_code = trim($global_e->attr["lang"]);
} else {
$lang_code = trim($global_e->attr["xml:lang"]);
}
// return no error if language code is not specified
if (!BasicChecks::isValidLangCode($lang_code)) {
return true;
}
$rtl_lang_codes = BasicChecks::getRtlLangCodes();
if (in_array($lang_code, $rtl_lang_codes)) {
// When these 2 languages, "dir" attribute must be set and set to "rtl"
return strtolower(trim($global_e->attr["dir"])) == "rtl";
} else {
return !isset($global_e->attr["dir"]) || strtolower(trim($global_e->attr["dir"])) == "ltr";
}
}
