composer 安装

要安装Composer，你可以按照以下步骤进行操作：

1. 打开命令行窗口。
2. 执行以下命令将最新版本的Composer安装到你的系统中：
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
php composer-setup.php
php -r "unlink('composer-setup.php');"
这些命令将从https://install.phpcomposer.com/下载Composer安装脚本，并执行安装过程。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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