composer安装扩展包与常用命令 1.安装composer官方源： composer config -g repo.packagist composer https://packagist.phpcomposer.com 阿里云源： composer config repo.packagist composer https://mirrors.aliyun.com/composer/ 腾讯云源： composer config -g repos.packagist composer https://mirrors.cloud.tencent.com/composer/2.常用命令查看composer版本 composer -v 升级composer版本 composer self-update composer从2版本降到1版本composer self-update 1.10.24 或者 composer self-update --1更新但不自动升级到更高版本 composer update --no-plugins 查看composer 的配置 composer config -g -l 修改composer 的镜像源 composer config -g repo.packagist composer https://mirrors.cloud.tencent.com/composer/composer 比较常用的镜像源composer官方 https://packagist.orgphp官方 https://packagist.phpcomposer.com阿里云 https://mirrors.aliyun.com/composer腾讯云 https://mirrors.cloud.tencent.com/composer华为云 https://mirrors.huaweicloud.com/repository/phplaravel(中国) https://packagist.laravel-china.org显示所有的扩展包composer show -i 查看关联包 composer why 命名空间/包名 例如： composer why symfony/deprecation-contracts 移除包 composer remove 命名空间/包名 例如： composer remove symfony/deprecation-contracts 安装某个扩展包 composer require 命名空间/包名 例如： composer require symfony/deprecation-contracts3.常见问题1、更新composer出现版本不匹配，插件丢失等问题的解决方法：删除composer.lock 文件，删除vendor目录里的全部文件重新执行composer install --ignore-platform-reqs 或者 composer update --ignore-platform-reqs--ignore-platform-reqs 这个是忽略php版本匹配的意思{dotted startColor="#ff6c6c" endColor="#1989fa"/}转自：https://blog.csdn.net/qq15577969/article/details/126687778

composer 镜像操作以及采用命令 全局配置更换到 阿里镜像 composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/ 取消配置 composer config -g --unset repos.packagist项目配置将当前项目更换到阿里云镜像 composer config repo.packagist composer https://mirrors.aliyun.com/composer/ 取消配置 composer config --unset repos.packagist其他操作更新到最新版本 composer self-update 执行诊断命令 composer diagnose 清除缓存 composer clear 若项目之前已通过其他源安装，则需要更新 composer.lock 文件，执行命令 composer update --lock composer 命令增加 -vvv 可输出详细的信息 composer -vvv require alibabacloud/sdk 查看已安装的包 composer show composer show -t 查找相关的包 composer show 'symfony/*' symfony 为要查找的关键字