启用镜像服务的方式有两种:
系统全局配置: 即将配置信息添加到 Composer 的全局配置文件 config.json 中。
单个项目配置: 将配置信息添加到某个项目的 composer.json 文件中。

例1:修改 composer 的全局配置文件(推荐方式)
打开命令行窗口(windows用户)或控制台(Linux、Mac 用户)并执行如下命令:
  
composer config -g repo.packagist composer https://packagist.phpcomposer.com

例2:修改当前项目的 composer.json 配置文件:
打开命令行窗口(windows用户)或控制台(Linux、Mac 用户),进入你的项目的根目录(也就是composer.json 文件所在目录),执行如下命令:

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

上述命令将会在当前项目中的 composer.json文件的末尾自动添加镜像的配置信息(你也可以自己手工添加):

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


以 laravel 项目的 composer.json 配置文件为例,执行上述命令后如下所示(注意最后几行):

 
{
        "name": "laravel/laravel",
        "description": "The Laravel Framework.",
        "keywords": [
            "framework",
            "laravel"
        ],
        "license": "MIT",
        "type": "project",
        "require": {
            "php": ">=5.5.9",
            "laravel/framework": "5.2.*"
        },
        "require-dev": {
            "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": [
                "php artisan clear-compiled",
                "php artisan optimize"
            ],
            "pre-update-cmd": [
                "php artisan clear-compiled"
            ],
            "post-update-cmd": [
                "php artisan optimize"
            ]
        },
        "config": {
            "preferred-install": "dist"
        },
        "repositories": {
            "packagist": {
                "type": "composer",
                "url": "https://packagist.phpcomposer.com"
            }
        }
    }


OK,一切搞定!试一下 composer install 来体验飞一般的速度吧!
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