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Opcode caches save energy, expenses, improve overall user experience on web sites, and it's often one of the simplest optimizations to implement. This article will explain the basics of installing, configuring, and tuning an opcode cache for PHP, the Alternative PHP Cache (APC).

Opcode caches save energy, expenses, improve overall user experience on web sites, and it's often one of the simplest optimizations to implement. This article will explain the basics of installing, configuring, and tuning an opcode cache for PHP, the Alternative PHP Cache (APC).
APC and Opcode Caches

The Alternative PHP Cache is "a free, open, and robust framework for caching and optimizing PHP intermediate code." Other opcode caches exist for PHP and a list of the known opcode caches have been cited at the end of this article for those interested in further research2. This article will also assume usage of a common server environment such as Apache with mod_php.

APC is an actively maintained open source project available via PECL (http://pecl.php.net)). APC offers a several configurations for performance tuning, a user variable cache, and plans to support an optimizer currently under development. Opcode caches give PHP applications a large performance gain by avoiding the lexical analysis and parsing of human readable source code during the compilation phase of PHP (this will be discussed in detail later).



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