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Merge pull request #89 from stevenbenner/gh-pages

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Added object caching sub-section
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Phil Sturgeon
2012-07-13 01:23:29 -07:00
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## Object Caching
There are times when it can be beneficial to cache individual objects in your code, such as with data that is expensive
to get or database calls where the result is unlikely to change. You can use object caching software to hold these
pieces of data in memory for extremely fast access later on. If you save these items to a data store after you retrieve
them, then pull them directly from the cache for following requests you can gain a significant improvement in
performance as well as reduce the load on your database servers.
Many of the popular bytecode caching solutions let you cache custom data as well, so there's even more reason to take
advantage of them. APC, XCache, and WinCache all provide APIs to save data from your PHP code to their memory cache.
The most commonly used memory object caching systems are APC and memcached. APC is an excellent choice for object
caching, it includes a simple API for adding your own data to its memory cache and is very easy to setup and use. The
one real limitation of APC is that it is tied to the server it's installed on. Memcached on the other hand is installed
as a separate service and can be accessed across the network, meaning that you can store objects in a hyper-fast data
store in a central location and many different systems can pull from it.
In a networked configuration APC will usually outperform memcached in terms of access speed, but memcached will be able
to scale up faster and further. If you do not expect to have multiple servers running your application, or do not need
the extra features that memcached offers then APC is probably your best choice for object caching.
Example logic using APC:
{% highlight php %}
<?php
$data = apc_fetch('expensive_data');
if (!$data)
{
$data = get_expensive_data();
apc_store('expensive_data', $data);
}
{% endhighlight %}
Learn more about popular object caching systems:
* [APC Functions](http://php.net/manual/en/ref.apc.php)
* [Memcached](http://memcached.org/)
* [Redis](http://redis.io/)
* [XCache APIs](http://xcache.lighttpd.net/wiki/XcacheApi)
* [WinCache Functions](http://www.php.net/manual/en/ref.wincache.php)