在 Windows 10 系统中安装 Laravel Installer

好处和坏处

好处

可以通过 Laravel Installer 安装 Laravel。它比用 Composer Create-Project 的好处是：

1. 命令简单

$ laravel new blog

# VS

$ composer create-project --prefer-dist laravel/laravel blog

2. 来源不同

使用 Laravel Installer 有两种安装项目的命令：

• laravel new blog
• laravel new blog --dev

它们对应的下载地址是：

• http://cabinet.laravel.com/latest.zip
• http://cabinet.laravel.com/latest-develop....

就是说用 Laravel Installer 安装包是从官网提供的地址下载的、不是从 Composer 库里取的。

坏处

Laravel Installer 不能指定下载的版本号。这个时候就要用 Composer Create-Project 了。

$ composer create-project --prefer-dist laravel/laravel blog "5.3.*" 

安装

执行命令 composer global require "laravel/installer"，全局安装 Laravel Installer。在 Windows 10 系统中，Composer 安装的全局软件放在 C:/Users/zhangb/AppData/Roaming/Composer 文件夹下。

C:\Users\zhangb>composer global require "laravel/installer"
Changed current directory to C:/Users/zhangb/AppData/Roaming/Composer
Using version ^1.3 for laravel/installer
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 10 installs, 0 updates, 0 removals
  - Installing symfony/process (v3.3.2): Loading from cache
  - Installing psr/log (1.0.2): Loading from cache
  - Installing symfony/debug (v3.3.2): Loading from cache
  - Installing symfony/polyfill-mbstring (v1.4.0): Loading from cache
  - Installing symfony/console (v3.3.2): Loading from cache
  - Installing guzzlehttp/promises (v1.3.1): Downloading (100%)
  - Installing psr/http-message (1.0.1): Downloading (100%)
  - Installing guzzlehttp/psr7 (1.4.2): Downloading (100%)
  - Installing guzzlehttp/guzzle (6.3.0): Downloading (100%)
  - Installing laravel/installer (v1.3.6): Downloading (100%)
symfony/console suggests installing symfony/event-dispatcher ()
symfony/console suggests installing symfony/filesystem ()
Writing lock file
Generating autoload files

将路径 C:\Users\zhangb\AppData\Roaming\Composer\vendor\bin 添加到全局变量中。下面打开命令行界面，就可以使用 laravel 命令了。

源码

刚才有说，「Laravel Installer 安装包是从官网提供的地址下载的、不是从 Composer 库里取」。依据何在——从源码里看到的。源码在 C:/Users/zhangb/AppData/Roaming/Composer/vendor/laravel/installer/src/NewCommand.php 中。有一个 download 方法。

/**
 * Download the temporary Zip to the given file.
 *
 * @param  string  $zipFile
 * @param  string  $version
 * @return $this
 */
protected function download($zipFile, $version = 'master')
{
    switch ($version) {
        case 'develop':
            $filename = 'latest-develop.zip';
            break;
        case 'master':
            $filename = 'latest.zip';
            break;
    }

    $response = (new Client)->get('http://cabinet.laravel.com/'.$filename);

    file_put_contents($zipFile, $response->getBody());

    return $this;
}

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