参考链接：http://www.blogjava.net/nkjava/archive/2015/01/20/422289.html

yum list installed | grep php

yum remove  php.x86_64 php-cli.x86_64 php-common.x86_64

rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm

yum install php56w.x86_64 php56w-cli.x86_64 php56w-common.x86_64 php56w-gd.x86_64 php56w-ldap.x86_64 php56w-mbstring.x86_64 php56w-mcrypt.x86_64 php56w-mysql.x86_64 php56w-pdo.x86_64

php -v

yum search bcmath

yum install php56w-bcmath.x86_64    #安装模块