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Matomo Developer Documentation



Copyright Matomo team. Do not republish, or copy, or distribute this code or content. Thank you!

Run locally

$ cd app/
$ composer install
$ mkdir tmp/cache
$ mkdir tmp/templates
$ cd public/
$ php -S

To disable caching and enable debugging, create a app/config/local.php file with the following:

define('CACHING_ENABLED', false);
define('DEBUG', true);

Without cache, the website might be slow because of the inclusion of remote files (through HTTP). You can disable that locally by adding this to your local.php:

define('DISABLE_INCLUDE', true);

Automatic documentation generation (API-Reference)

The first time

# Clone Matomo repository the first time
git clone piwik
# Download the dependencies for our generator 
cd generator/
composer install
cd ../piwik/
# Now we download composer
php -r "copy('', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === 'e115a8dc7871f15d853148a7fbac7da27d6c0030b848d9b3dc09e2a0388afed865e6a3d6b3c0fad45c48e2b5fc1196ae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"

Generate the API reference docs

  • Execute ./
  • Commit
  • Push

or just execute ./

The documents will be generated into the docs/generated directory. It will always generate the documentation for the latest stable version.

How to add docs for a new Matomo version

  • Increase version number for LATEST_PIWIK_DOCS_VERSION in config/app.php
  • Add a new line to eg php generator/generate.php --branch=4.x-dev --targetname=4.x similar to the other ones. You might also want to copy the generation success detection.
  • Copy pictures from the previous version into latest version eg from public/img/3.x to public/img/4.x and update all needed pictures.
  • In app/routes/page.php we might need to update the branch for the latest CHANGELOG version in the /changelog route see eg . It will be important that we merge all changes to the changelog for different Matomo versions into the changelog of the latest Matomo version as we currently want to show one changelog across all versions.

How to manage docs for different Matomo versions

So far, docs can be put into docs/2.x, docs/3.x and directly under docs/. If eg a guide is requested for Piwik 2, we first look for docs in docs/2.x and if not found for docs in docs/. This allows us to have some pages always the same, eg "Support" page, "Matomo Core Development", etc. So far I have left all guides under docs/ as not many docs will actually change for Matomo 3. This way, when changing a document under docs/ it will be updated for Piwik 2 and Matomo 3.

As soon as something on a guide changes for Matomo 3, we should copy that article into docs/2.x and afterwards make adjustments on the content for Matomo 3.

If a guide will be removed for a newer Matomo version and does not exist in the latest Matomo version anymore we should setup a redirect in app/helpers/Redirects.php eg to redirect /guides/pages to /2.x/guides/pages. This can be optional as the 404 Error page would suggest to open that page.

When does an article need to be copied into a versioned docs folder?

  • When an article references a resource / URL that is not available for another Matomo version. For example an article links to the API reference guide to a class that is not available in another Matomo version
  • When links for some reason are not the same for 2 different Matomo versions in general
  • When an article references eg menu items or something else but it is not the same across Matomo versions. For example there is no user menu in Matomo 3 anymore, or Plugin Settings are now split into "Personal Settings" and "General Settings". In such a case we need to make a copy of that article as the guide would be wrong otherwise.
  • When a submenu is different across Matomo versions. Submenus are usually defined in markdown files, for example under "Develop => Plugin Basics" submenu items are defined in If we eg add a new Import API into Matomo X we would need to create that new guide under /docs so it will be also available for Matomo 4 etc and then copy /docs/ into /docs/2.x/ and next add the menu item to /docs/
  • There can be many more reasons. In general if articles are different between 2 versions for various reasons because they mention eg outdated classes, outdated configs etc or when links break between 2 Matomo versions etc we need to created a copy of that guide, put it into eg docs/2.x and then update the existing article under /docs.

How do we handle images for different Matomo versions?

Images are always stored in a versioned directory. Eg public/img/2.x/* and public/img/3.x/*. When there is a new Matomo version we need to copy all the images from the previous version and put them into a new Matomo directory. In guides you would still reference an image via /img/myimage.jpg and the Markdown parser will add the path for the currently selected Matomo version and turn it into either eg /img/2.x/myimage.jpg or /img/3.x/myimage.jpg. With a new Matomo version often the UI changes and this way it keeps things simple by having always different images and by not using the same image across different Matomo versions.

Writing guides

Just edit the docs/*.md files. Any change you make there should be available on the developer website within a minute.

Guides are written using Markdown. CommonMark and Markdown Extra are supported.

In addition:

  • headers have an autogenerated HTML ID (so that they can be linked to). You can also use Markdown Extra to explicitly define it: ## Some title {#some-title-id}
  • you can include remote files as-is using:
    • {@include}: the content is not escaped
    • {@include escape}: the content will be escaped

Adding a new guide

Create a new Markdown file in docs/ and use YAML Front Matter to configure it:

category: Develop
# The title

Lorem ipsum…

YAML Front Matter is YAML embedded at the top of Markdown files. It is commonly used to define metadata, and we use it to define several items:

  • category: the name of the category (Develop, Integrate, Design, API Reference)
  • subGuides: allows you to define a list of sub-guides (will appear in the left sidebar)
  • previous: allows you to define the previous guide (a link will be added at the end of the guide, it does not affect the sidebar)
  • next: allows you to define the next guide (a link will be added at the end of the guide, it does not affect the sidebar)

A guide must be either added to a category menu or set as a "sub-guide" of another guide. It cannot be both (else it will appear twice in the left sidebar).

To add a guide to a category (i.e. it will appear in the left sidebar) edit the PHP class for the category (in app/helpers/Content/Category).

Supported inline tags in PHP comments

The following tags can be used in PHP docblocks so that they can be turned to links in the API reference.

{@hook Request.dispatch}                    // link to Request.dispatch hook
{@hook Request.dispatch description text}   // link to Request.dispatch hook with different link text
{@hook # description}                       // link to hooks page

Note: In contrast to @link we do not check whether a hook with the given name exists.

{@link Map}                  // class within this namespace
{@link Piwik\DataTable\Map}  // full classname
{@link \Exception}           // php internal class
{@link serialize()}          // php internal function
{@link getKeyName()}         // method within this class
{@link $myproperty}          // property within this class
{@link INDEX_NB_UNIQ_VISITORS}  // constant within this class, note: a link will be only generated if the constant has a long description
{@link Map::getKeyName()}    // method from any class
{@link Map::$myproperty}     // property from any class
{@link Piwik\Metrics::INDEX_NB_UNIQ_VISITORS}  // constant from any class, note: a link will be only generated if the constant has a long description
{@link}    // http link
{@link}   // https link
{@link mailto:test}          // mailto link

{@link Map Description Text}                  // class within this namespace
{@link Piwik\DataTable\Map Description Text}  // full classname
{@link \Exception Description Text}           // php internal class
{@link getKeyName() Description Text}         // method within this class
{@link $myproperty Description Text}          // property within this class
{@link Map::getKeyName() Description Text}    // method from any class
{@link Map::$myproperty Description Text}     // property from any class
{@link Description Text}    // http link
{@link Description Text}   // https link
{@link mailto:test Description Text}          // mailto link

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