having php4 and PHP5 available

[AndyII]

I need help,
some newer scripts are built on php5 but I have plenty of users that depend on php4, I dont want to break anything on a production server but need to have php5 available as a choice on a per user basis.
how do I install php5 and have it so I can choose who will use which version?
I am not any skilled person and have to do things for myself, dont have the person who used to help ( he is no longer with us ) and I have hard time with trusting a new person with the servers.
can someone do a "how to" guide.
I see a few posts here about using both and custombuild so I think this is possible...
please help

 

[massive]

http://directadmin.com/forum/showthread.php?t=29824

 

[AndyII]

Thank you, I did find that and have it book marked.
I am not a skilled shell person and am afraid I may break something
so I run php4 as CLI and php5 as CGI?, I see many updates I would like, like freetype, zend etc .
then I just add to .htaccess to choose other than default
1st time is always the most difficult .
is there a way to revert to what was in the case of total disaster?

 

[massive]

CGI is a little more compilcated because you have to fix the permission of the folders/files.
If eg sites that requires php4 are more than php5 then install cli for php4 and cgi for php5 and opposite.