Pauli, Julien; Ferrara, Anthony; Popov, Nikita (2013). "Memory management". PhpInternalsBook.com. Archived from the original on 10 November 2023. Retrieved 10 November 2023.
Pauli, Julien; Ferrara, Anthony; Popov, Nikita (2013). "Memory management". PhpInternalsBook.com. Archived from the original on 10 November 2023. Retrieved 10 November 2023.