How to use PHP OPCache?
opcache, php
Solution
Installation
OpCache is compiled by default on PHP5.5+. However it is disabled by default. In order to start using OpCache in PHP5.5+ you will first have to enable it. To do this you would have to do the following.
Add the following line to your `php.ini`:
zend_extension=/full/path/to/opcache.so (nix)
zend_extension=C:\path\to\php_opcache.dll (win)
Note that when the path contains spaces you should wrap it in quotes:
zend_extension="C:\Program Files\PHP5.5\ext\php_opcache.dll"
Also note that you will have to use the `zend_extension` directive instead of the "normal" `extension` directive because it affects the actual Zend engine (i.e. the thing that runs PHP).
Usage
Currently there are four functions which you can use:
`opcache_get_configuration()`:
Returns an array containing the currently used configuration OpCache uses. This includes all ini settings as well as version information and blacklisted files.
var_dump(opcache_get_configuration());
`opcache_get_status()`:
This will return an array with information about the current status of the cache. This information will include things like: the state the cache is in (enabled, restarting, full etc), the memory usage, hits, misses and some more useful information. It will also contain the cached scripts.
var_dump(opcache_get_status());
`opcache_reset()`:
Resets the entire cache. Meaning all possible cached scripts will be parsed again on the next visit.
opcache_reset();
`opcache_invalidate()`:
Invalidates a specific cached script. Meaning the script will be parsed again on the next visit.
opcache_invalidate('/path/to/script/to/invalidate.php', true);
Maintenance and reports
There are some GUI's created to help maintain OpCache and generate useful reports. These tools leverage the above functions.
OpCacheGUI
Disclaimer I am the author of this project
Features:
- OpCache status
- OpCache configuration
- OpCache statistics
- OpCache reset
- Cached scripts overview
- Cached scripts invalidation
- Multilingual
- Mobile device support
- Shiny graphs
Screenshots:
URL: https://github.com/PeeHaa/OpCacheGUI
opcache-status
Features:
- OpCache status
- OpCache configuration
- OpCache statistics
- Cached scripts overview
- Single file
Screenshot:
URL: https://github.com/rlerdorf/opcache-status
opcache-gui
Features:
- OpCache status
- OpCache configuration
- OpCache statistics
- OpCache reset
- Cached scripts overview
- Cached scripts invalidation
- Automatic refresh
Screenshot:
URL: https://github.com/amnuts/opcache-gui
Problem
PHP 5.5 has been released and it features a new code caching module called OPCache, but there doesn't appear to be any documentation for it. So where is the documentation for it and how do I use OPcache?