composer linux安装

环境阿里云

1.Linux 平台可以使用以下命令来安装：

复制到本地
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
安装
php composer-setup.php

All settings correct for using Composer
Downloading...

Composer (version 1.6.5) successfully installed to: /root/composer.phar
Use it: php composer.phar
移动 composer.phar，这样 composer 就可以进行全局调用：;

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

2. 切换为国内镜像：

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

执行时候可能遇到以下报错

PHP Warning:  putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 160

Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/vendor/composer/xdebug-handler/src/Process.php on line 160
PHP Warning:  putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/bin/composer on line 57

Warning: putenv() has been disabled for security reasons in phar:///usr/local/bin/composer/bin/composer on line 57

函数putenv()被禁用了 ,而安装修改配置时用到了该函数
/usr/local/php/etc/php.ini进入编辑状态
输入/，进入搜索模式，找到disable_functions
寻找disable_functions字符串，将后面的putenv删除

3. 更新 composer：

composer selfupdate

4.查看版本

composer -V