composer更新版本

composer更新版本

1、查看当前composer版本（大写的V）

composer -V

2、当前composer更新为最新稳定版

composer self-update --stable

3、更新到指定版本

composer self-update 2.0.8

4、 版本回滚

回滚到安装的上一个版本

composer self-update --rollback

5、版本更新并删除旧版本的备份

composer self-update --clean-backups

6、composer self-update 参数详解

# composer self-update --help
Description:
  Updates composer.phar to the latest versionUsage:
  self-update [options] [--] [<version>]
  selfupdateArguments:
  version                        The version to update toOptions:
  -r, --rollback                 Revert to an older installation of composer
      --clean-backups            Delete old backups during an update. This makes the current version of composer the only backup available after the update
      --no-progress              Do not output download progress.
      --update-keys              Prompt user for a key update
      --stable                   Force an update to the stable channel
      --preview                  Force an update to the preview channel
      --snapshot                 Force an update to the snapshot channel
      --1                        Force an update to the stable channel, but only use 1.x versions
      --2                        Force an update to the stable channel, but only use 2.x versions
      --2.2                      Force an update to the stable channel, but only use 2.2.x LTS versions
      --set-channel-only         Only store the channel as the default one and then exit
  -h, --help                     Display help for the given command. When no command is given display help for the list command
  -q, --quiet                    Do not output any message
  -V, --version                  Display this application version
      --ansi|--no-ansi           Force (or disable --no-ansi) ANSI output
  -n, --no-interaction           Do not ask any interactive question
      --profile                  Display timing and memory usage information
      --no-plugins               Whether to disable plugins.
      --no-scripts               Skips the execution of all scripts defined in composer.json file.
  -d, --working-dir=WORKING-DIR  If specified, use the given directory as working directory.
      --no-cache                 Prevent use of the cache
  -v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debugHelp:
  The self-update command checks getcomposer.org for newer
  versions of composer and if found, installs the latest.  php composer.phar self-update  Read more at https://getcomposer.org/doc/03-cli.md#self-update-selfupdate