How do I check if Composer is installed correctly?
To check whether Composer is installed correctly, first run the composer --version command to view the version information. If the version number is displayed, it means that it is installed. Secondly, use the composer diagnose command to detect configuration problems to ensure that the environment variables and permissions are normal. Finally, try to verify the functional integrity through the composer requires monolog/monolog installation package. If the vendor directory is successfully created and the dependency is downloaded, it means that Composer is fully available. If the above steps fail, you may need to check whether PHP has been installed globally or adjusted the system path settings.
You can tell if Composer is installed correctly by running a simple command in your terminal or command prompt. If it's working, you'll see version info and a list of available commands.
Check the Composer Version
The quickest way to verify Composer is to ask it for its version. Just type:
composer --version
If you see something like Composer version 2.xx
, then it's installed and working. If not, you might get an error like command not found
or 'composer' is not recognized
, which means it's either not installed or not in your system path.
A common issue on some systems (especially Windows) is that the environment variables aren't set up right after installing XAMPP or WAMP. In that case, try running Composer from the installation directory or re-run the setup with the "enable command-line" option.
Run a Basic Composer Command
Another good test is to run a basic Composer command like:
composer diagnose
This checks for common issues in your setup and reports them. It doesn't change anything—it just tells you what might be off. For example, it might warn you if your vendor/bin
directory isn't in the PATH or if there are permission problems.
If everything looks green and clean, Composer is probably ready to use.
Try Initializing a New Project
A more practical test is to create a new project using a standard package. You can do this by creating a test folder and running:
mkdir testproject && cd testproject composer requires monolog/monolog
This downloads and installs the Monolog library into your vendor
folder. If it completes without errors and creates the vendor/
directory and composer.json
, then Composer is fully functional.
If it fails, double-check your PHP installation—Composer relies on PHP being available in the command line. You can confirm that by typing:
php -v
And seeing if PHP reports a version number.
That's basically all there is to checking if Composer works. If the version shows up, diagnose passes, and you can install a package, you're good to go. Any issues usually come down to path settings or PHP not being available globally.
The above is the detailed content of How do I check if Composer is installed correctly?. For more information, please follow other related articles on the PHP Chinese website!

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