composer 安装脚本
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');" && php composer-setup.php && php -r "unlink('composer-setup.php');" && mv composer.phar /usr/local/bin/composer
切换回 1.x 版本:
composer self-update --1
切换至 2.x 版本:
composer self-update --2
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