UserField::checkContainsUFKeys

static function checkContainsUFKeys($fields)
{
	if(!Type::isIterable($fields))
	{
		return false;
	}

	foreach($fields as $fld => $value)
	{
		if(static::isUFKey($fld))
		{
			return true;
		}
	}

	return false;
}