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This article mainly explains "what is the use of composer in php". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what is the use of composer in php"?

Php composer usage: 1, install composer.json;2, add packages to the existing composer.json; 3, update through "composer update"; 4, create projects with dependent packages.

This article operating environment: windows7 system, PHP7.1&&Composer version 2.0, Dell G3 computer.

What is the use of php composer?

The operation of composer is very complicated, which is usually not needed, and it will be difficult to find it at 01:30.

Daily operation, let's go

Part one: install composer.json

Composer init

This command creates a composer.json file, or you can manually create edits, declaring dependencies and versions.

For more information on composer.json content format, please see

{"require": {"monolog/monolog": "1.0.*"}} composer install

Create and fill in the composer.json and execute the install command for the first installation

The first installation will check the listed software packages, dependencies, etc., to find the appropriate (through constraints) version number

A lock file composer.lock will be generated after that

The exact version number of each package is recorded in the lock file.

When you perform the installation again, you will check whether the lock file exists, and install it directly as specified in the lock file.

Part 2: add a package to the project (composer.json already exists)

Composer require dependency package / dependency package: version number

You can also add multiple spaces to open eg: doctrine/orm:1.0.0 at the same time

Part III: update

Composer update

This command ignores the lock file, updates the dependencies listed in composer.json, and regenerates the lock file

Part IV: create a project with a dependency package

Composer create-project dependent package / dependent package path version version

Note that when you create a project with a package, you can also specify a version, but the version is constrained by the third parameter, and the second parameter is the project path (relative). No specified version the latest version is installed by default

Eg: laravel/laravel path 5.8.0

Appendix

Switch Chinese mirror sources

Composer config-g repo.packagist composer https://packagist.phpcomposer.com

In a production environment, the installation initialization project uses the-o option. See the official documentation for details.

-optimize-autoloader (- o):

Converting PSR-0/4 autoloading to classmap results in faster loading support. This is recommended especially in a production environment, but because it takes some time to run, it is not used as the default.

At this point, I believe you have a deeper understanding of "what is the use of composer in php". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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