(a) General rule.--If satisfied that the statements made in the petition are true, that the needs and welfare of the person proposed to be adopted will be promoted by the adoption and that all requirements of this part have been met, the court shall enter a decree so finding and directing that the person proposed to be adopted shall have all the rights of a child and heir of the adopting parent or parents and shall be subject to the duties of a child to him or them.
(b) Withdrawal or dismissal of petition.--In any case in which the petition is withdrawn or dismissed, the court shall enter an appropriate order in regard to the custody of the child.