CentOS 5
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Install PHP
Install PHP to use PHP Script on httpd.
[1] Install PHP.
[root@www ~]#
yum -y install php php-mbstring php-pear
[root@www ~]#
/etc/rc.d/init.d/httpd restart

Stopping httpd:
[ OK ]

Starting httpd:
[ OK ]

[2] Create a PHP test page and access to it with a web browser on Client to make sure it works normally.
[root@www ~]#
vi /var/www/html/index.php
<div style="width: 100%; font-size: 40px; font-weight: bold; text-align: center;">
   print Date("Y/m/d");