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Reference Material

PHP Manual
Zend Framework
Smarty Template Engine
PEAR Manual

Memory management

Basic memory management
Data persistence
Thread-Safe Resource Manager

Memory management in the Zend Engine is deceptively simple. There are some APIs to learn, and some concepts behind them to understand, but that's about all.

PHP Manual

PHP at the Core: A Hacker's Guide to the Zend Engine:

Preface
The "counter" Extension - A Continuing Example
The PHP 5 build system
Extension structure
Memory management
Working with variables
Writing functions
Working with classes and objects
Working with resources
Working with INI settings
Working with streams
PDO Driver How-To
Extension FAQs
Zend Engine 2 API reference
Zend Engine 2 opcode list
Zend Engine 1

Memory management

Table of Contents

PHP Manual