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Composer is specific what to do, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

For example, if we want to use a http component to send and receive HTTP messages, search for http in the search box, and the first result we get is Guzzle.

Composer

Packagist is the community for finding PHP components, and Composer is the tool for installing PHP components. Composer is PHP's dependency manager, runs on the command line, you tell Composer which components you need, Composer will download and automatically load these components into your project, it's as simple as that.

Composer and Packagist work closely together. If you tell Composer that you want to use the guzzlehttp/guzzle component, Composer will get the guzzlehttp/guzzle component from Packagist, find the repository address of the component, determine which version to use, and find out the dependencies of the component. Then download the guzzlehttp/guzzle component and its dependencies to your project.

In addition, Composer automatically generates PSR-compliant autoloaders for all PHP components in the project, effectively abstracting dependency management and autoloading, so for the PHP community, Composer is one of the most important additional tools, without one, it's not too much to think about the painful days before we had to use things like include, require, and spl_autoload_register to implement automatic loading manually.

Sample project

Next, we use an example project to demonstrate how to use Composer and components to develop a PHP application. The role of this application is to scan the URL in a CSV file to find out the dead chain. The application will send a HTTP request to each URL. If the returned HTTP status code is greater than or equal to 400, the dead chain will be sent to standard output. This is a command-line application, and once developed, we will execute the script, pass in the path to the csv file, and display a list of dead chains in the standard output.

Install component

Before we begin, let's see which tasks can be solved using existing PHP components: we need a component that iterates over the csv file data, and we also need to send HTTP requests to each URL in the csv file, so we also need a component that can send HTTP requests and check HTTP responses.

After browsing the Packagist, we found two components, guzzlehttp/guzzle and league/csv, the former for processing HTTP messages and the latter for processing CSV data.

The lock file lists all PHP components used by the project, as well as the specific version number of the component, which actually locks the project so that the project can only use a specific version of the PHP component. The advantage is that composer will download the specific version listed in this file, regardless of the latest version available in Packagist, you should bring the composer.lock file into version control, so that team members use the same version of PHP as you do, and if the local development and server use the same version of the PHP component, you can minimize the bug caused by different component versions.

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