rpm -Uvh http://mirror.webtatic.com/yum/el6/latest.rpm
yum install php55w php55w-opcache
yum install yum-plugin-replace
yum replace php-common --replace-with=php55w-common相关包：
php55w php55w-bcmath php55w-cli php55w-common php55w-dba php55w-devel php55w-embedded php55w-enchant php55w-fpm php55w-gd php55w-imap php55w-interbase php55w-intl php55w-ldap php55w-mbstring php55w-mcrypt php55w-mssql php55w-mysql php55w-mysqlnd php55w-odbc php55w-opcache php55w-pdo php55w-pecl-memcache php55w-pecl-xdebug php55w-pgsql php55w-process php55w-pspell php55w-recode php55w-snmp php55w-soap php55w-tidy php55w-xml php55w-xmlrpc