In all cases of violation of any of its ordinances, any city of the second class, in addition to the modes provided by law, shall have the right to recover, in a civil action, the amount of the penalty or fines provided by the bylaws or ordinances of these cities or imposed by the mayor thereof for a violation of any ordinance or bylaw. In addition to the power to enforce payment of a fine or penalty by imprisonment, the mayor shall have full power to issue an execution or writ of garnishment, to be executed by the marshal, in like manner and with like effect as if issued by a justice of the peace in any civil action tried before him, and like proceedings be had thereunder.