错误描述：
#yum install libmcrypt libmcrypt-devel mcrypt mhash
Setting up Install Process
No package PHP-mcrypt available.
Error: Nothing to do
解决方法：
yum install epel-release //扩展包更新包 yum update//更新yum源 yum install libmcrypt libmcrypt-devel mcrypt mhash
