I have a PHP question: How do I make a 404 redirect?

[Jacob__mybb_import1]

Create a file called .htaccess in the folder where your website is, and put this line in it:

ErrorDocument 404 /error.php

Didn't work.

This only works on Apache (by far the most popular web server to use with PHP). If you're using IIS, you'll have to do it some other way.