53 Pa. Stat. § 13349
Any police officer or constable, upon view of the breach of any ordinance of any city of the first class, is authorized to forthwith arrest the person or persons so offending, without any process, and to take said person or persons forthwith before any police magistrate or alderman of said city, who shall thereupon require bail for the appearance of said person at a time to be fixed for the hearing of said charge, and in default of bail to commit for a hearing; and at said hearing the case shall be proceeded with as if the parties were appearing before said magistrate or alderman upon a summons duly issued and returned served, or if both parties desire it the case may be entered and determined by the magistrate or alderman in like manner, without requiring bail or further continuance.
53 P.S. § 13349