include command in php?

[Hobbes]

I'm not sure if you can use SSI calls on a php3 page, so how do you include a file (in my case text, when included on the webpage it displays pretty HTML lol) with php code? Thanks.

[Sick N Twisted]

<?php include ("PATH"); ?>

[Woofcat]

For maximum efficiency -

If the file you're including contains PHP code:
require('file.inc');

If the file you're including contains Perl code:
virtual('file.inc');

If the file you're including is text/html only:
readfile('file.inc');

[Nick]

What's the fastest one to use that works out the http root?

[Hobbes]

Thank you Woofcat *S*