Tenes que agregar esto en tu httpd.conf
Código:
<IfModule mod_mime.c>
AddType application/x-httpd-php .php
AddType application/x-httpd-php .phtml
AddType application/x-httpd-php .php3
AddType application/x-httpd-php .php4
AddType application/x-httpd-php .html
AddType application/x-httpd-php-source .phps
</IfModule>
Acordate de reiniciar APACHE !!!!