39 Pa. Stat. § 13
The court of common pleas of any county, in which any person may be confined by sentence or order of any court of this commonwealth until he restore any stolen goods or chattels, or pay the value thereof; or in which any person may be confined for the nonpayment of any fine or of the costs of prosecution, or upon conviction of fornication and bastardy, and for no other cause, shall discharge such person from confinement on his making application and conforming to the provisions herein directed in the case of insolvents, who have been arrested on civil process: Provided, That where such person shall have been sentenced to the payment of a fine, or after a conviction of fornication and bastardy, he shall not be entitled to make such application until after he shall have been in actual confinement for a period of not less than three months, except in case of a fine not exceeding fifteen dollars, exclusive of costs, in which event the actual confinement need not exceed thirty days.
39 P.S. § 13