注意：http://packagist.phpcomposer.com 这个似乎出问题了，现在的建议使用这个https://packagist.laravel-china.org/

国外镜像太慢了, 太慢了, 慢了, 了

在全局或项目中添加

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{
    "repositories": [
        {"type": "composer", "url": "http://packagist.phpcomposer.com"},
        {"packagist": false}
    ]
}

例一 修改 composer 的全局配置文件

命令行中执行

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composer config -g repositories.packagist composer http://packagist.phpcomposer.com

例二 修改项目中的 composer.json 配置文件(laravel, 最后一个节点)

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{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.1.*"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~4.0",
        "phpspec/phpspec": "~2.1"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/TestCase.php"
        ]
    },
    "scripts": {
        "post-install-cmd": [
            "php artisan clear-compiled",
            "php artisan optimize"
        ],
        "pre-update-cmd": [
            "php artisan clear-compiled"
        ],
        "post-update-cmd": [
            "php artisan optimize"
        ],
        "post-root-package-install": [
            "php -r \"copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ]
    },
    "config": {
        "preferred-install": "dist"
    },
    "repositories": [
        {"type": "composer", "url": "http://packagist.phpcomposer.com"},
        {"packagist": false}
    ]
}

参考: composer镜像