Composer常用的命令整理

1、composer查看全局设置：composer config -gl

2、查看已存在的包：composer info [***] or composer show [***]

3、搜索包：composer search ***

4、安装包：composer require或者composer install

composer require monolog/monolog 添加指定包
composer require monolog/monolog:1.19 添加指定包和版本
composer require monolog/monolog=1.19
composer require monolog/monolog 1.19

对于 require 和 install 是不相同的，require 会把包的信息添加到 composer.json 文件中并进行 install 。
而 install 是直接从 composer.json 或 composer.lock 文件中提取依赖信息，然后进行安装。

不编辑composer.json的情况下安装库:
你可能会觉得每安装一个库都需要修改composer.json太麻烦，那么你可以直接使用require命令。如：composer require "foo/bar:1.0.0"

5、清理缓存：composer clearcache

6、依赖性检测：composer depends ***

7、设置composer镜像为国内镜像：

composer config -g repo.packagist composer https://packagist.phpcomposer.com

也可以用下面这个：
//全局配置
composer config -g repos.packagist composer https://mirrors.tencent.com/composer/
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

//单独项目配置
composer config repo.packagist composer https://mirrors.aliyun.com/composer/    

8、卸载某个扩展或者删除某个包：composer remove

composer remove vendorName/packageName
这只是删除了依赖关系，不会自动加载，但其依赖包还在vender文件夹里，可手动删除

9、诊断：composer diagnose

➜  basic composer diagnose                   
Checking composer.json: OK
Checking platform settings: OK
Checking git settings: OK
Checking http connectivity to packagist: OK
Checking https connectivity to packagist: OK
Checking github.com rate limit: FAIL
[Composer\Downloader\TransportException] The "https://api.github.com/rate_limit" file could not be downloaded: failed to open stream: Connection refused
Checking disk free space: OK
Checking pubkeys: 
Tags Public Key Fingerprint: 57815BA2 7E54DC31 7ECC7CC5 573090D0  87719BA6 8F3BB723 4E5D42D0 84A14642
Dev Public Key Fingerprint: 4AC45767 E5EC2265 2F0C1167 CBBB8A2B  0C708369 153E328C AD90147D AFE50952
OK
Checking composer version: OK
Composer version: 1.10.8
PHP version: 7.2.7
PHP binary path: /Applications/MAMP/bin/php/php7.2.7/bin/php
OpenSSL version: OpenSSL 1.0.2o  27 Mar 2018
以上是执行结果就是检测的结果正常,但有时可能出现一些警告，具体情况具体分析。

设置一个本地或全局的composer配置：
composer config secure-http false
全局设置：
composer config -g secure-http false

composer self-update --rollback

10、Mac上卸载Composer:

where composer 或者type composer或brew info composer

rm -rf /usr/bin/composer
rm -rf /usr/local/bin/composer.phar

11、Composer升级到v2.x：composer self-update --2

12、Composer回退到v1.X：composer self-update --1

慎用composer update！慎用composer update！慎用composer update！

参考：
https://pkg.phpcomposer.com/#how-to-install-composer
https://blog.csdn.net/wulove52/article/details/78392663
PHP 开发者该知道的 5 个 Composer 小技巧：
https://www.phpcomposer.com/5-features-to-know-about-composer-php/

https://segmentfault.com/q/1010000003876622/a-1020000006835543
https://developer.aliyun.com/composer?spm=a2c6h.13651102.0.0.3e221b11ccSpCA

正确的 Composer 扩展包安装方法:
https://www.cnblogs.com/caicaizi/p/9131845.html

修复：https://getcomposer.org/doc/articles/troubleshooting.md#general