yum -y install php72w-devel
yum -y install php72w-pear

#参考
pecl help #列出全部命令
pecl help command-name #查看某个命令的用法

#配置
pecl config-show

#查看
pecl list #已安装的扩展
pecl list-all  #所有可以安装的扩展
pecl list-upgrades #可更新的扩展
pecl list-channels #本地配置的渠道列表
pecl info pack-name

#安装 步骤包含(configure,make,make install)
pecl install pack-name

#升级（修改）
pecl upgrade pack-name

#卸载
pecl uninstall pack-name

#搜索
pecl search pack-name

#下载源码包
pecl download pack-name

#下载
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"

php composer-setup.php

php -r "unlink('composer-setup.php');"

#安装
#linux
sudo mv composer.phar /usr/local/bin/composer

#windows
1，composer.phar复制到php.exe的目录下
1，在php.exe的目录下，创建 composer.bat
2，内容：@php "%~dp0composer.phar" %*

#初始化
composer init

#命令列表
composer list

#命令说明
composer help command-name

#配置
composer help config
composer config -l #当前目录的composer.json配置
composer config -l -g #全局配置
composer confgi --editor [-g] #编辑composer.json配置

composer config key
composer config key val
compsser config --unset key

#安装
composer install #通过composer.lock或composer.json安装
composer require pack-name #下载一个包

#卸载
composer remove pack-name #卸载一个包

#查看本地包列表
composer show #需要在composer项目目录种运行
composer show pack-name #查看某个包的使用信息

#搜索：从资源url处搜索
composer search pack-name

#更新
composer update #全部更新
composer update pack-name1 [pack-name2...] #更新指定包
composer update pack-name:version #更新到指定版本

#其他
composer self-update #更新composer的本版
composer dump-autoload #刷新自动加载器，无需借组install或update

requires composer-plugin-api ^1.1.0 -> found composer-plugin-api[2.0.0] but it does not match the constraint.

#尝试：
composer update -vvv
composer diagnose

if ($this->files->exists($path = $this->vendorPath.'/composer/installed.json')) {
   $packages = json_decode($this->files->get($path), true);
}
#$packages 替换为
$installed = json_decode($this->files->get($path), true);
$packages = $installed['packages'] ?? $installed;

//或者尝试
composer self-update --rollback