2021-1-6 aslronx
#第一步
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
#第二步
php composer-setup.php
#第三步
php -r "unlink('composer-setup.php');"
#第四步
sudo mv composer.phar /usr/local/bin/composer
#升级到1.x
composer self-update --1
#升级到2.x
composer self-update --2
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