composer 使用详解

1，安装

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === 'aa96f26c2b67226a324c27919f1eb05f21c248b987e6195cad9690d5c1ff713d53020a02ac8c217dbf90a7eacc9d141d') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"mv composer.phar /usr/local/bin/composer

2，配置中国全量镜像  

使用如下命令可以看到默认的包地址是{"type":"composer","url":"https?://packagist.org","allow_ssl_downgrade":true}

composer config -g repo.packagist

 使用如下命令设置中国全量镜像

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

 
3，常用命令

composer init #初始化，生成composer.json配置文件
composer search monolog #查找库
composer show --all monolog/monolog #查看库信息，包括版本信息
composer install #根据配置文件安装库
composer require monolog/monolog
composer update #更新库