一招轻松搞定 Composer 全局安装
先要设置好 Windows 系统搜索路径环境变量，也就是把你的php安装目录，比方说“d:\phpRE\php\；”“d:\phpRE\php\ext\；”添加到“环境变量”路径中，实现全局安装以生成最新的“composer.phar”依赖包。
快捷安装：关闭防火墙→将 “Composer-Setup.exe” 复制到 PHP 的安装目录下面，也就是和 php.exe 在同一级目录→运行“Composer-Setup.exe”安装composer→用shift+右键打开当前命令窗口输入命令：php composer_installer.phar 正式安装composer.phar
如果用win32的Composer-Setup.exe安装不成功，就换成下面的几步自定义安装方法，也可以轻松搞定 Composer 全局安装：
“composer_installer.phar”＋”composer.cmd”到php目录下→用shift+右键打开当前命令窗口输入命令：
php composer_installer.phar→生成最新的依赖包”composer.phar”→你需要使用 composer 部署第三方Apps时就在应用目录下（必须与composer.json文件同在根目录）shift+右键打开当前命令窗口→用命令“composer install/update”轻松下载安装/更新和部署Apps就OK了
具体应用：
①全局安装成功后可使用Comporser创建开发项目的目录架构。composer install命令是将项目所有的依赖包下载到本项目vendor目录下，而通过composer create-project <框架等依赖包原始名字>/<默认名字> <别名> <项目名> <版本号> 命令则是将所有的代码及其依赖的包放到所命名的项目目录下，相当于执行了一个git clone命令），然后再打开此项目目录进行PhpStom本地开发和远程测试。
②在 composer.json 文件中列出你项目所需的依赖包，加上一点简单的命令，Composer 将会自动帮你下载并设置你的项目依赖。composer require 这个指令会增加一个项目依赖，如果你还没有 composer.json 文件, 将会创建一个。下面的例子将为项目加入 Twig 依赖。
composer require twig/twig:~1.8
上面举例是需要一个版本为 ~1.8 ，意味着 “任何大于 1.8.0 ，但小于 2.0.x-dev 的版本”。你也可以使用通配符 * 在 1.8.* 之中。Composer在composer update 时将升级你的所有依赖到你限制的最新版本。
③ composer init 命令将会引导你创建一个完整的 composer.json 文件到你的项目之中。无论你使用哪种方式，一旦你创建了 composer.json 文件，你可以告诉 Composer 去下载及安装或更新升级你的依赖到 /vendor/ 目录中。
④依赖包更新通知：要接收关于新版本的更新通知。你可以注册 VersionEye，这个 web 服务可以监控你的 Github 及 BitBucket 帐号中的 composer.json 文件，并且当包有新更新时会发送邮件给你。
⑤程序中自动加载composer简单方法：只需要在引用文件中，加入下面一行引用代码
require_once __DIR__.’/vendor/autoload.php’;
⑥可以在根目录下用命令composer config repo.packagist composer https://packagist.phpcomposer.com修改composer.json配置文件来更换镜像源以快速获取国内镜像。也可经常执行 composer selfupdate 检查更新以保持 Composer 一直是最新版本。
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