Linux下全局安装Composer

Composer 是 PHP 用来管理依赖（dependency）关系的工具；你可以在自己的项目中声明所依赖的外部工具库（libraries），Composer 会帮你安装这些依赖的库文件

下面开始安装

1、下载 composer

curl -sS https://getcomposer.org/installer | php

2、将 composer.phar 文件移动到 bin 目录以便全局使用 composer 命令

mv composer.phar /usr/local/bin/composer

3、切换国内阿里云的源，全局配置，即所有项目都会使用该镜像地址

composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

取消配置：

composer config -g --unset repos.packagist

4、输入 composer 验证：

Composer version 1.10.7 2020-06-03 10:03:56

Usage:

command [options] [arguments]

Options:

-h, --help                     Display this help message
-q, --quiet                    Do not output any message
-V, --version                  Display this application 

version

--ansi                         Force ANSI output

--no-ansi                      Disable ANSI output

-n, --no-interaction           Do not ask any interactive question

--profile                      Display timing and memory usage information

--no-plugins                   Whether to disable plugins.

-d, --working-dir=WORKING-DIR  If specified, use the given directory as working directory.

--no-cache                     Prevent use of the cache

-v|vv|vvv, --verbose           Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

PS：使用 root 运行 composer 的话可能会提示

Do not run Composer as root/super user! See https://getcomposer.org/root for details

也就是叫你不要用 root 用户运行，不过不影响正常使用