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Editor to share with you how to install composer, I hope you will get something after reading this article. Let's discuss it together.

Some learning and understanding about composer

Composer is not a package manager. Yes, it involves "packages" and "libraries", but it is managed on a project-by-project basis and installed in a directory of your project (such as vendor). By default, it does not install anything globally. Therefore, this is just a dependency management.

This idea is not new, and Composer is strongly inspired by node's npm and ruby's bundler. At that time, there was no similar tool under PHP.

Composer will solve the problem for you like this:

You have a project that depends on several libraries.

Some of these libraries depend on others.

You declare what you rely on.

Composer will find out which version of the package needs to be installed and install them (download them to your project).

Because laravel is managed using composer, everything is based on laravel.

Download and install composer

What is added here is:

Due to some reasons, it is very slow to access foreign composer resource websites, which often leads to errors due to connection timeout in composer install or update, so it is changed to Chinese mirror image.

Global: composer config-g repo.packagist composer https://packagist.phpcomposer.com partial project (to be executed under the project's current directory): composer config repo.packagist composer https://packagist.phpcomposer.com

This paragraph will be added to the composer.json file after the command is executed, which means that the Chinese image has been added successfully, and this image will be given priority when executing commands such as composer install or update.

"repositories": {"packagist": {"type": "composer", "url": "https://packagist.phpcomposer.com"}}"

Use composer selfupdate to keep the version of the composer tool itself up to date

About composer.json files {"name": "laravel/laravel", "description": "The Laravel Framework.", "keywords": ["framework", "laravel"], "license": "MIT", "type": "project", "require": {/ / this is the project that tells composer that it must be installed Equivalent to production environment "php": "> = 5.5.9", "laravel/framework": "5.2.*", / / require requires a package name This is the package name "laravelcollective/html": "5.2.*", "yuanchao/laravel-5-markdown-editor": "dev-master"}, "require-dev": {/ / this is the project that the development needs to install, which is equivalent to the development environment. You can use-no-dev to cancel the package "fzaninotto/faker": "~ 1.4"," mockery/mockery ":" 0.9.* "," phpunit/phpunit ":" ~ 4.0", "symfony/css-selector": "2.8.* | 3.0.*", "symfony/dom-crawler": "2.8.* | 3.0.*"} "autoload": {"classmap": ["database"], "psr-4": {"App\": "app/"}}, "autoload-dev": {"classmap": ["tests/TestCase.php"]}} "scripts": {"post-root-package-install": ["php-r\" copy ('.env.example', '.env') \ ""], "post-create-project-cmd": ["php artisan key:generate"], "post-install-cmd": ["Illuminate\\ Foundation\\ ComposerScripts::postInstall", "php artisan optimize"], "post-update-cmd": ["Illuminate\\ Foundation\\ ComposerScripts::postUpdate" "php artisan optimize"]}, "config": {"preferred-install": "dist"}}

Version of the package name

Exact version number-1.0.2-you can specify the exact version of the package. Range-> = 1.0 > = 1.0, 1.0, 1.0, 1.2-A valid version range can be specified by using the comparison operator. Valid operators: >, > =,

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