最近有新項目需要搭建，發現composer安裝項目有報錯信息

PHP Deprecated:  Return type of Symfony\Component\Console\Helper\HelperSet::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in phar:///usr/local/bin/composer/vendor/symfony/console/Helper/HelperSet.php on line 112

Deprecated: Return type of Symfony\Component\Console\Helper\HelperSet::getIterator() should either be compatible with IteratorAggregate::getIterator(): Traversable, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in phar:///usr/local/bin/composer/vendor/symfony/console/Helper/HelperSet.php on line 112

初步排查，composer庫不是新的了

?經過翻譯，果然是版本長時間沒更新，Composer version 2.0.13?有些方法棄用了

查看當前composer版本和基本信息

composer -V

?

composer

確定了當前版本，就可以升級下版本看結果了

composer selfupdate

提示升級成功，如果想回退的話執行 就能回到上個版本（升級成功的話，切勿操作）

composer self-update --rollback

最后看下升級完成后的版本?

composer -V

?

錯誤解決，又可以和composer一起玩耍了?