How can i change to PHP4?

If you want to change from PHP5 to PHP4, only edit /var/www/fcgi/your-domain.tld/php5-fcgi-starter and change the last line from:

exec /usr/bin/php5-cgi

to

exec /usr/bin/php4-cgi

This can be done for every domain. So one domain can run with PHP4 and the other domain can run with PHP5 at the same time.

After this change you have to restart your Apache.

 
 # /etc/init.d/apache restart