遇到 You are using an outdated version of Composer 的解决办法

报错：

Warning from https://mirrors.aliyun.com/composer: You are using an outdated version of Composer. Composer 2 is now available and you should upgrade. See https://getcomposer.org/2

从报错信息可以看出是composer版本太旧的。

解决办法：

升级本地的composer版本

composer self-update

升级成功

Updating to version 2.0.11 (stable channel).
   Downloading (100%)
Use composer self-update --rollback to return to version 1.9.1

升级成功后可能会遇到的问题：

The "easywechat-composer/easywechat-composer" plugin was skipped because it requires a Plugin API version ("^1.0") that does not match your Composer installation ("2.0.0"). You may need to run composer update with the "--no-plugins" option.

此时你要考虑你用的composer.phar版本问题，有可能是更新后的composer版本过高，当前的包更新还不支持此版本。

因此，执行退回版本吧。

composer self-update --rollback

总结：

composer版本过低，提示无伤大雅，能正常更新包就无所谓升不升级了，如果非要升级，请统计所有包能支持的最高composer版本，再指定版本进行更新。

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