First of all make the apache server with qualified domain name.
1. Enable UserDir module.
2. Edit /etc/apache2/httpd.conf
AddType application/x-httpd-php .php
# Use for PHP 5.x:
#LoadModule php5_module modules/libphp5.so
AddHandler php5-script php
# Add index.php to your DirectoryIndex line:
DirectoryIndex index.html index.php
AddType text/html php
3. Add following at the end of /etc/apache2/apache2.conf
Include /etc/apache2/sites-enabled/
AddType application/x-httpd-php .php
UserDir /home/*/public_html
