Apache Server Config

[InNeedofHelp]

How do I set my apache server to use a 404.php page in response to 404 errors instead of a 404.shtml page? I read somewhere you use like

ErrorDocument 404 /404.php

but where do I edit that? And it's on a server taht supports multiple domains, and I want this to happen only one of the domains... is that a problem?

[thetestingsite]

Using htaccess would be your best bet without actually editing the main server config. Just make a plain text file name .htaccess and place the code you posted above in that file.

Hope this helps.