[mmarif4u]

So yesterday it was working, but today got problem. Did you reinstall the server b4 the problem. If you are getting open dialog box for php files, it is in most cases, that php apache mod is not installed or maybe not configured.
What you can do is:
1- Look for php-apache-module in yast2.
if above didnot work then try this.
2- Try to enable the php5 module in the Apache config. If you look in the file /etc/sysconfig/apache2 and the setting APACHE_MODULES doesn't have php5 in the list, you have not enabled PHP.

Try it and let us know.