centos 添加 composer

• 下载安装包

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

   

• 把 composer 把复制到 /usr/bin/composer

  mv composer.phar /usr/bin/composer

   

• composer 运行，ok

• caomposer 报错，以及解决方法

  Failed to decode response: zlib_decode(): data error
    Retrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info

解决方法是： 

composer -vvv update