使用 composer命令安装的时候提示以下错误：

Failed to decode zlib stream

解决办法：

yum install epel-release
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
yum update