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<!--
tagline: Script are callbacks that are called before/after installing packages
-->
# Scripts
## What is a script?
A script, in Composer's terms, can either be a PHP callback (defined as a
static method) or any command-line executable command. Scripts are useful
for executing a package's custom code or package-specific commands during
the Composer execution process.
**NOTE: Only scripts defined in the root package's `composer.json` are
executed. If a dependency of the root package specifies its own scripts,
Composer does not execute those additional scripts.**
## Event names
Composer fires the following named events during its execution process:
- **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-status-cmd**: occurs before the `status` command is executed.
- **post-status-cmd**: occurs after the `status` 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.
- **pre-autoload-dump**: occurs before the autoloader is dumped, either
during `install`/`update`, or via the `dump-autoload` command.
- **post-autoload-dump**: occurs after the autoloader is dumped, either
during `install`/`update`, or via the `dump-autoload` command.
- **post-root-package-install**: occurs after the root package has been
installed, during the `create-project` command.
- **post-create-project-cmd**: occurs after the `create-project` command is
executed.
## Defining scripts
The root JSON object in `composer.json` should have a property called
`"scripts"`, which contains pairs of named events and each event's
corresponding scripts. An event's scripts can be defined as either as a string
(only for a single script) or an array (for single or multiple scripts.)
For any given event:
- Scripts execute in the order defined when their corresponding event is fired.
- An array of scripts wired to a single event can contain both PHP callbacks
and command-line executables commands.
- PHP classes containing defined callbacks must be autoloadable via Composer's
autoload functionality.
Script definition example:
{
"scripts": {
"post-update-cmd": "MyVendor\\MyClass::postUpdate",
"post-package-install": [
"MyVendor\\MyClass::postPackageInstall"
],
"post-install-cmd": [
"MyVendor\\MyClass::warmCache",
"phpunit -c app/"
]
}
}
Using the previous definition example, here's the class `MyVendor\MyClass`
that might be used to execute the PHP callbacks:
<?php
namespace MyVendor;
use Composer\Script\Event;
class MyClass
{
public static function postUpdate(Event $event)
{
$composer = $event->getComposer();
// do stuff
}
public static function postPackageInstall(Event $event)
{
$installedPackage = $event->getOperation()->getPackage();
// do stuff
}
public static function warmCache(Event $event)
{
// make cache toasty
}
}
When an event is fired, Composer's internal event handler receives a
`Composer\Script\Event` object, which is passed as the first argument to your
PHP callback. This `Event` object has getters for other contextual objects:
- `getComposer()`: returns the current instance of `Composer\Composer`
- `getName()`: returns the name of the event being fired as a string
- `getIO()`: returns the current input/output stream which implements
`Composer\IO\IOInterface` for writing to the console