How to use composer

How to use composer?
The above describes how to install composer. This chapter will explain how to use composer.
We first simulate downloading a PHP component. First, we search dump on the Packagist website. We can see a list
// vendor:厂商名 package:包名 composer require vendor/packageSo when we install symfony/var-dumper, the command line input:
composer require symfony/var-dumperComposer will automatically find the stable version of var-dumper for us to install. We can see the successful installation prompt:

<?php require "vendor/autoload.php"; dump(['1','2','3']); dump(123);First introduce the automatic loader, and then use the dump method to output variables. The dump method is what we A function that outputs variables in the dump component package. The following picture is the result seen after running the file, which outputs different printing styles:

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