What is php composer usage?

php composer usage: 1. Install composer.json; 2. Add packages to the existing composer.json; 3. Update through "composer update"; 4. Create a project with dependent packages.

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

What is php composer usage?

Composer has many and complicated operations. Most of them are not used at ordinary times. If you are looking for them, it will be difficult to find them for a while.

Daily operations, get started

Part 1 : Install composer.json

composer init

This command creates a composer.json file. You can also create and edit it manually to declare dependencies and versions.

composer.json content format, see

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

. For version constraints, see

composer install

Create and fill in composer.json, execute Install command to perform the first installation

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

After that, a lock file will be generated composer.lock

The lock file records the exact version number of each package

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

Part 2: Add packages to the project (composer.json already exists)

composer require dependency package/dependency package: version number

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

Part 3: Update

composer update

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

Part 4: Create a project with dependent packages

composer create-project  依赖包/依赖包  路径路径  版本版本

Note that when creating a project with a package, you can also specify the version, but the version is constrained to the third parameter, and the second parameter is the project Path (relative). If the unspecified version is not specified, the latest version will be installed by default

eg： laravel/laravel path 5.8.0

Appendix

Switching the Chinese mirror source

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

In the production environment, use the -o option to install the initialization project. See the official documentation for details

--optimize-autoloader (-o):

Convert PSR-0/4 autoloading to classmap for faster loading support. This is recommended especially in a production environment, but since it takes some time to run, it is not the default value.

Recommended learning: "PHP Video Tutorial" "composer Tutorial"

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