Composer サーバーが拡張機能のインストールに失敗した場合の対処方法

ubuntu@VM-0-9-ubuntu:~/demo/easyswoole$ composer require easyswoole/easyswoole=3.x ./composer.json has been created Loading composer repositories with package information Updating dependencies (including require-dev) Installation failed, deleting ./composer.json. [ErrorException] "continue" targeting switch is equivalent to "break". Did you mean to use "continue 2"? require [--dev] [--prefer-source] [--prefer-dist] [--no-plugins] [--no-progress] [--no-update] [--update-no-dev] [--update-with-dependencies] [--ignore-platform-reqs] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--] []..

ubuntu@VM-0-9-ubuntu:~/demo/easyswoole$ composer -V Composer version @package_branch_alias_version@ (1.0.0-beta2) 2016-03-27 16:00:34

ubuntu@VM-0-9-ubuntu:~$ composer self-update [InvalidArgumentException] Command "self-update" is not defined.

wget https://dl.laravel-china.org/composer.phar -O /usr/local/bin/composer sudo chmod a+x /usr/local/bin/composer

sudo mv /usr/bin/composer /tmp/ sudo ln -s /usr/local/bin/composer /usr/bin/composer ubuntu@VM-0-9-ubuntu:~$ composer -V Composer version 1.8.5 2019-04-09 17:46:47