在centos直接使用yum install 安装php的话版本比较低，如果需要高版本的话，请看如下：

Step 1: Installing Remi Repository

## Install Remi & Epel Repository on RHEL/CentOS 6.4-6.0 - 32 Bit ##
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm 

## Install Remi & Epel Repository on RHEL/CentOS 6.4-6.0 - 64 Bit ##
rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm 

## Install Remi Repository on RHEL/CentOS 5.9-5.0 - 32 Bit ##
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-5.rpm

## Install Remi Repository on RHEL/CentOS 5.9-5.0 - 64 Bit ##
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm
rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-5.rpm

Step 2: Installing Apache, MySQL 5.5.32 & PHP 5.5.0

## Installing on RHEL/CentOS 5-6 ##
# yum --enablerepo=remi,remi-test install httpd mysql mysql-server php php-common

Step 3: Installing PHP 5.5.0 Modules

## Installing on RHEL/CentOS 5-6 ##
# yum --enablerepo=remi,remi-test install php-mysql php-pgsql php-pecl-mongo php-sqlite 
php-pecl-memcache php-pecl-memcached php-gd php-mbstring php-mcrypt php-xml php-pecl-apc php-cli 
php-pear php-pdo

Step 4: Starting/Stopping Apache & MySQL 5.5.32

## Enable Apache and MySQL on Run-Levels ##
# chkconfig --levels 235 httpd on
# chkconfig --levels 235 mysqld on

## Apache Commands ## 
# /etc/init.d/httpd start
# /etc/init.d/httpd stop
# /etc/init.d/httpd status

## MySQL Commands ## 
# /etc/init.d/mysqld start
# /etc/init.d/mysqld stop
# /etc/init.d/mysqld status
好了差不多了，配置测试之类网上很多资料！！！