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Style consistency Round 2

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- spacing of jekyll tags at top of file
- line wrap at 120 chars
- url/link verification and move to bottom and order
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jrfnl
2014-12-08 05:16:00 +01:00
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_posts/14-02-01-Opcode-Cache.md
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## Opcode Cache {#opcode_cache_title}
When a PHP file is executed, under the hood it is first compiled to opcodes and, only then, the opcodes are executed.
If a PHP file is not modified, the opcodes will always be the same. This means that the compilation step is a waste of CPU resources.
If a PHP file is not modified, the opcodes will always be the same. This means that the compilation step is a waste of
CPU resources.
This is where opcode caches come in. They prevent redundant compilation by storing opcodes in memory and reusing it on successive calls.
Setting up an opcode cache takes a matter of minutes, and your application will speed up significantly. There's really no reason not to use it.
This is where opcode caches come in. They prevent redundant compilation by storing opcodes in memory and reusing it on
successive calls. Setting up an opcode cache takes a matter of minutes, and your application will speed up
significantly. There's really no reason not to use it.
As of PHP 5.5, there is a built-in opcode cache called [OPcache][opcache-book]. It is also available for earlier versions.
As of PHP 5.5, there is a built-in opcode cache called [OPcache][opcache-book]. It is also available for earlier
versions.
Read more about opcode caches:
* [OPcache][opcache-book] (built-in since PHP 5.5)
* [APC](http://php.net/book.apc) (PHP 5.4 and earlier)
* [XCache](http://xcache.lighttpd.net/)
* [Zend Optimizer+](http://www.zend.com/products/server/) (part of Zend Server package)
* [WinCache](http://www.iis.net/download/wincacheforphp) (extension for MS Windows Server)
* [list of PHP accelerators on Wikipedia](http://en.wikipedia.org/wiki/List_of_PHP_accelerators)
* [APC] (PHP 5.4 and earlier)
* [XCache]
* [Zend Optimizer+] (part of Zend Server package)
* [WinCache] (extension for MS Windows Server)
* [list of PHP accelerators on Wikipedia][PHP_accelerators]
[opcache-book]: http://php.net/book.opcache
[APC]: http://php.net/book.apc
[XCache]: http://xcache.lighttpd.net/
[Zend Optimizer+]: http://www.zend.com/products/server/
[WinCache]: http://www.iis.net/download/wincacheforphp
[PHP_accelerators]: http://en.wikipedia.org/wiki/List_of_PHP_accelerators