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php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"

php composer-setup.php

php -r "unlink('composer-setup.php');"

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// macos
// composer.phar 文件移动到 /usr/local/bin/
sudo mv composer.phar /usr/local/bin/composer

// windows
// composer.phar 复制到 php.exe 在同一级目录
// 在 PHP 安装目录下新建一个 composer.bat 文件
@php "%~dp0composer.phar" %*

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