Alternative PHP Cache (APC) is a free and open opcode cache for PHP.
Quote:
What is PECL?
PECL is a repository for PHP Extensions, providing a directory of all known extensions and hosting facilities for downloading and development of PHP extensions.
The packaging and distribution system used by PECL is shared with its sister, PEAR
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Installing APC on Windows is simple task to do. Unfortunately, looking for the .dll file is not! The DLL's used to enable this in PHP4 to PHP6 can be found
here at PECL. Please choose the correct version based on your PHP version installed on your webserver.
Download and save the php_apc.dll file to your PHP extensions folder. On my PC, this folder is located here:
c:\php\ext
As soon as you have successfully downloaded the file, you will have to edit your php.ini. Open php.ini with your favourite text editor and insert a line like this:
Code:
;extension=php_yaz.dll
;extension=php_zip.dll
extension=php_apc.dll
Since I have no reason to tweak the APC configurations, I didn't insert any custom APC configuration values to the php.ini file. But if this is what you want to do, some of these options need to be set inside your php.ini file.
One such configuration option is the:
Code:
apc.shm_size "30" PHP_INI_SYSTEM
For those of you who don't already know it, the PHP_INI_SYSTEM in there means that this directive may only be set in the php.ini or Apache's httpd.conf files.
Save the php.ini file and restart Apache and you're ready to experiment using APC functions in your php scripts.
Mr Floris did a blog on
Installing APC on CentOS 5 Server 
