添加 yum 源
CentOS 6.x 的源
CentOS 7.x 的源
# rpm -Uvh http://ftp.iij.ad.jp/pub/linux/fedora/epel/7/x86_64/e/epel-release-7-5.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
安装 PHP
# yum install --enablerepo=remi,remi-php56 php php-opcache php-pecl-apcu php-devel php-mbstring php-mcrypt php-mysqlnd php-phpunit-PHPUnit php-pecl-xdebug php-pecl-xhprof php-pdo php-pear php-fpm php-cli php-xml php-bcmath php-process php-gd php-common
注：安装5.6版本为remi-php56,安装5.5版本为remi-php55
查看 PHP 版本
# php -v
PHP 5.6.18 (cli) (built: Feb 3 2016 10:25:33)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies
with Xdebug v2.3.3, Copyright (c) 2002-2015, by Derick Rethans