A clean and responsive interface for Zend OPcache information, showing statistics, settings and cached files, and providing a real-time update for the information.
If you're able and would like to sponsor this work in some way, then feel free to do so through the [GitHub Sponsorship](https://github.com/sponsors/amnuts) page.
Alternatively, if you'd just like to give me a [shout-out on Twitter](https://twitter.com/acollington) to say you use it, that'd be awesome, too! (Any one else miss postcardware?)
The easiest way to start using the opcache-gui is to clone this repo, or simply copy/paste/download the `index.php` file to a location which your web server can load. Then point your browser to that location, such as `https://www.example.com/opcache/index.php`.
Once in your `vendor` directory, there are numerous ways in which you can use the interface. For example, if you're using a framework such as Symfony or Laravel, you could load opcache-gui into a `Controller`. Your requirements of setting it up within your framework of choice will vary, so it's not really possible to detail how to do that within this readme... but I have faith in your ability to figure it out!
The namespace used for the class is `Amnuts\Opcache`, so once the dependency is in your `autoload.php` you can use the `\Amnuts\Opcache\Service` class. For example, you could do something like:
Then you can create whatever view you want with which to show the opcache details. Although there is a pretty neat React-based interface available for you in this repo.
Alternatively, include `vendor/amnuts/opcache-gui/index.php` directly and this'll give you the same result as just copying/pasting the `index.php` somewhere.
If you want to change any of the defaults, you can pass in just the ones you want to change if you're happy to keep the rest as-is. Just alter the array at the top of the `index.php` script (or pass in the array differently to the `Service` class). For example, the following would change only the `allow_reset` and `refresh_time` values but keep everything else as the default:
The interface has been split up to allow you to easily change the colours of the gui, the language shown, or even the core components, should you wish.
To run the build process, run the command `php ./build/build.php` from the repo root (you will need `nodejs` and `npm` already installed). Once running, you should see the output something like:
The build script will only need to install the `node_modules` once, so on subsequent builds it should be a fair bit quicker!
The build process will create a compiled css file at `build/interface.css` and the javascript of the interface will be in `build/interface.js`. You could probably use both of these within your own frameworks and templating systems, should you wish.
If you make any changes to the scss file then you'll need to run the build script in order to see the changes.
### The layout
If you want to change the interface itself, update the `build/_frontend/interface.jsx` file - it's basically a set of ReactJS components. This is where you can change the widget layout, how the file list works, pagination, etc.
Run the build script again should you make changes here.
### The javascript
The wrapper PHP template used in the build process, and that acts to pass various bits of data to the ReactJS side of things, is located at `build/template.phps`. If you wanted to update the version of ReactJS used, or how the wrapper html is structured (such as wanting to pass additional things to the ReactJS side of things), then this would be the file you'd want to update.
The template includes a few remote js files. If you want to make those local (for example, you have CSP policies in place and the remote urls are not whitelisted), then you can use the `-j` or `--local-js` flags when building, such as `php ./build/build.php -j`. This will fetch the remote script files and put them in the root of the repo, adjusting the links in the built `index.php` file to point to the local copies. If you want to build it again with remote files, run the command again without the flag.
### The language
There's an old saying that goes, "If you know more than one language you're multilingual, if you don't you're British." Not only is that a damning indictment of the British mentality towards other languages, but also goes to explain why the UI has only so far been in English - because I am, for all my sins, British.
However, thanks to contributions from other people it is possible to change the language used in the interface!
If the language pack is in the `build/_languages/` directory then you can use that with the `-l` or `--lang` flag. For example, if there is a `fr.json` language pack then you can use `php ./build/build.php -l fr` in order to build with that language.
The overview will show you all the core information. From here you'll be able to see what host and platform you're running on, what version of OPcache you're using, when it was last reset, the functions and directives available (with links to the php.net manual), and all the statistics associated with the OPcache (number of hits, memory used, free and wasted memory, and more).
You can filter the results to help find the particular scripts you're looking for and change the way cached files are sorted. From here you can invalidate the cache for individual files or invalidate the cache for all the files matching your search.
If you do not want to show the file list at all then you can use the `allow_filelist` configuration option; setting it to `false` will suppress the file list altogether.
If you have set up a list of files which you don't want cache by supplying an `opcache.blacklist_filename` value, then the list of files will be listed within this tab.
If you have not supplied that configuration option in the `php.ini` file then this tab will not be displayed. If you set the `allow_filelist` configuration option to `false` then this tab will not be displayed irrespective of your ini setting.
PHP 7.4 introduced the ability to pre-load a set of files on server start by way of the `opcache.preload` setting in your `php.ini` file. If you have set that up then the list of files specifically pre-loaded will be listed within this tab.
As with the ignored file, if you have not supplied the ini setting, or the `allow_filelist` configuration option is `false`, then this tab will not be displayed.
You can reset the whole cache as well as force individual files, or groups of files, to become invalidated so that they will be cached again.
Resetting can be disabled with the use of the configuration options `allow_reset` and `allow_invalidate`.
### Real-time updates
The interface can poll every so often to get a fresh look at the opcache. You can change how often this happens with the configuration option `refresh_time`, which is in seconds.
When the real-time updates are active, the interface will automatically update all the values as needed.
Also, if you choose to invalidate any files or reset the cache it will do this without reloading the page, so the search term you've entered, or the page to which you've navigated do not get reset. If the real-time update is not on then the page will reload on any invalidation usage.
* Added JIT buffer graph (optionally able to turn it off)
* Added JIT information to the memory usage panel
* Improved the JIT information shown in the directives
* Fixed a long outstanding interface bug that allowed you to see the 'invalidate all' link even if invalidation option was `false`
If you want to enable JIT you have to put in a value for the [opcache.jit_buffer_size](https://www.php.net/manual/en/opcache.configuration.php#ini.opcache.jit-buffer-size) ini setting, else it's disabled by default.
If you're not using PHP 8, the interface will compensate and not show the additional JIT information.
Added a new highlight chart to show the cached keys percentage with options to turn on/off the individual highlight graphs.
**Version 2.4.1**\
Mostly bug fixes
*`memory_consumption` and `max_file_size` config settings now display as human-readable sizes
* four missing directives have been included
* better handling if `file_cache_only` is active
* cache-control header set to not cache the page
**Version 2.4.0**\
Adds cookie store for the real-time state allowing real-time to be activated on load. Cookie name and TTL length can be adjusted in the config
**Version 2.3.0**\
Adds information for interned strings and PHP 5.4 compatibility
**Version 2.2.2**\
Brings in optimisations for the file listing when filtering
**Version 2.2.1**\
Has the gauges now updating with the real-time pulse and a couple rounding issues fixed
**Version 2.2.0**\
Provides the ability to turn on/off the file list (default is on)
**Version 2.1.0**\
Now provides a much easier way to configure some options, be it the poll time, toggling the ability to reset the cache, real-time updates, etc. It also allows you to show the big values (memory usage and hit rate) as gauge graphs instead of big numbers.
**Version 2.0.0**\
Introduces the use of React.js provides the ability to seamlessly update more of the information in real-time (well, every five seconds by default) - so now the files as well as the overview get refreshed. There is an updated look, removing the gradients and going for a flatter feel. And the code in general has had an overhaul.
The script requires PHP 7.1 or above. I'm not tempted to downgrade the code to make it compatible with version 7.0, and hopefully most people would have upgraded by now. But I really do appreciate that sometimes people just don't have the ability to change the version of PHP they use because it's out of their control. So if you're one of the unlucky ones, you can make the following changes to `index.php` (or `Service.php` and run the build script). For the lines:
```
public function getOption(?string $name = null)
public function getData(?string $section = null, ?string $property = null)
public function resetCache(?string $file = null): bool
```
It'll just be a case of removing the `?` from each of the params.
A number of people have questioned whether the opcache-gui is working on their instance of PHP-FPM, as the files shown don't appear to be everything that's cached, and that's different to what Apache might show.
Essentially, that's expected behaviour. And thanks to a great comment from contributor [Michalng](https://github.com/amnuts/opcache-gui/issues/78#issuecomment-1008015099), this explanation should cover the difference:
> The interface can only show what it knows about the OPcache usage of its own OPcache instance, hence when it's accessed through Apache with mod_php, then it can only see the OPcache usage of that Apache webserver OPcache instance. When it's accessed with classic CGI, it can only see itself being cached as a new PHP and OPcache instance is created, in which case OPcache itself often doesn't make sense.
>
> To be able to monitor and manage the OPcache for all web applications, all need to use the same FastCGI, i.e. PHP-FPM instance.
>
> In case of Apache, one then often needs to actively configure it to not use it's internal mod_php but send PHP handler requests to the shared PHP-FPM server via mod_proxy_fcgi, which also requires using the event MPM. That is generally seen as the preferred setup nowadays, especially for high traffic websites. This is because every single incoming request with MPM prefork + mod_php creates an own child process taking additional time and memory, while with event MPM and dedicated PHP-FPM server a (usually) already waiting handler thread is used on Apache and on PHP end, consuming nearly no additional memory or time for process spawning.
