在 CentOS 6.9 系统下安装 php 5.6 的过程中，执行如下命令：
yum -y install php56w-pdo php56w-xml php56w-gd php56w-gd.x86_64 php56w-ldap.x86_64 \
php56w-mbstring.x86_64 php56w-mcrypt.x86_64 php56w-mysql.x86_64 php56w-pdo.x86_64 php56w-opcache.x86_64
报错：
Error: Package: php56w-mcrypt-5.6.40-1.w6.x86_64 (webtatic) Requires: libmcrypt.so.4()(64bit) You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest
根据提示：需要 libmcrypt 软件包
安装 epel-release 源即可解决。
yum install epel-release -y
Centos 6.9安装 php5.6 过程中报错：Error: Package: php56w-mcrypt-5.6.40-1.w6.x86_64 (webtatic)
原文：https://www.cnblogs.com/morgan363/p/11865613.html