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composer/doc/articles/scripts.md

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# Scripts
## What is a script?
A script is a callback (defined as a static method) that will be called
when the event it listens on is triggered.
**Scripts are only executed on the root package, not on the dependencies
that are installed.**
## Event types
- **pre-install-cmd**: occurs before the install command is executed.
- **post-install-cmd**: occurs after the install command is executed.
- **pre-update-cmd**: occurs before the update command is executed.
- **post-update-cmd**: occurs after the update command is executed.
- **pre-package-install**: occurs before a package is installed.
- **post-package-install**: occurs after a package is installed.
- **pre-package-update**: occurs before a package is updated.
- **post-package-update**: occurs after a package is updated.
- **pre-package-uninstall**: occurs before a package has been uninstalled.
- **post-package-uninstall**: occurs after a package has been uninstalled.
## Defining scripts
Scripts are defined by adding the `scripts` key to a project's `composer.json`.
They are specified as an array of classes and static method names.
The classes used as scripts must be autoloadable via Composer's autoload
functionality.
Script definition example:
```json
{
"scripts": {
"post-update-cmd": "MyVendor\\MyClass::postUpdate",
"post-package-install": ["MyVendor\\MyClass::postPackageInstall"]
}
}
```
Script listener example:
```php
<?php
namespace MyVendor;
class MyClass
{
public static function postUpdate($event)
{
// do stuff
}
public static function postPackageInstall($event)
{
$installedPackage = $event->getOperation()->getPackage();
// do stuff
}
}
```