To install the Composer plug-in, please first confirm that Composer is installed and the composer.json file exists, and then follow the following steps: 1. Make sure Composer has been installed and created composer.json; 2. Search and copy the required plug-in name on Packagist; 3. Use the composer require command to install the plug-in, such as composer require dealerdirect/phpcodesniffer-composer-installer; 4. Verify whether the plug-in is effective and check compatibility and configuration. Follow these steps to correctly install the Composer plug-in.
Installing a Composer plugin isn't much different from installing any other PHP package—it just requires a few specific steps to make sure everything works properly. Here's how to do it.
1. Make Sure You Have Composer Installed
Before you install a plugin, confirm that Composer is installed globally or at least available in your project. You can check this by running:
composer --version
If you see a version number (like Composer version 2.xx
), you're good to go. If not, you'll need to install Composer first .
Also, ensure your composer.json
file exists in your project root. If it doesn't, run:
composer init
and follow the prompts to create one.
2. Find the Plugin You Want to Install
Composer plugins are usually found on Packagist . Search for something like "composer plugin" plus what you want it to do—like code sniffing, asset management, etc.
For example, if you're looking for a plugin that helps with PHP CS fixes, you might come across dealerdirect/phpcodesniffer-composer-installer
.
Once you've found the right package, copy its name (eg, dealerdirect/phpcodesniffer-composer-installer
).
3. Install the Plugin Using Composer
Most Composer plugins are installed just like regular packages—with the require
command. Run:
composer requires vendor/plugin-name
So using our earlier example:
composer require dealerdirect/phpcodesniffer-composer-installer
This will:
- Add the plugin to your
composer.json
- Download and install it into the
vendor
directory - Update the autoloader
Some plugins may automatically register themselves. Others might require extra configuration in your composer.json
—check the plugin's documentation for details.
4. Verify That the Plugin Works
After installation, try running a Composer command that should be affected by the plugin. For example, if you installed a custom installer plugin, test whether it handles files as expected after running:
composer install
Or, if it's a command-line plugin, check if new commands show up when you run:
composer
If nothing happens or you get an error, double-check:
- The plugin is compatible with your Composer version
- Your
composer.json
has correct config (if needed) - You didn't miss any post-install steps
That's basically it. It's not complicated once you know where to look, but it's easy to miss small details like missing dependencies or configuration tweaks.
The above is the detailed content of How do I install a Composer plugin?. For more information, please follow other related articles on the PHP Chinese website!

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