Basic question seeks simple answer.

[Firefox Wins]

This was posted @ MyBB a while back; Someone was trying to show others an easy way to make custom pages.

PHP Code:

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<?php define('IN_MYBB', 1); require "./global.php"; add_breadcrumb("Welcome Page", "welcome.php"); eval("\$welcome = \"".$templates->get("welcome")."\";"); output_page($welcome); ?>

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For a quick and easy MyBB Hack / If I use Yumi/Zinga's php in templates plugin, then...
Rule #1 Basic questions should be simple....
...re-writing code...

PHP Code:

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<?php define('IN_MYBB', 1); require "./global.php"; add_breadcrumb("New Index", "./new_idea/index.php"); eval("\$new_index = \"".$templates->get("new_index")."\";"); output_page($new_index); ?>

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If I use Yumi/Zinga's php in templates plugin:
The file /new_idea/index.php (and / or the template) could contain the index page of almost any simple GPL script or class from here @phpclasses.org, as long as the other script doesn't have a conflicting login, "headers already sent", or namespace / variable issue?

Asking the same question in one simple sentence:
Learning a template system can be very confusing at first; The above code could be a really easy way to use a variety of php files along with MyBB, correct?
Glad to get some help, thanks for being here.

[ZiNgA BuRgA]

You don't have to use MyBB's template system at all actually.

If you're trying to integrate scripts together, it will really depend on what level of integration you want, and how the other scripts function.  For example, if all you want is the MyBB header on the other script, you'll need to somehow pass the $header variable to the other script, depending on how it outputs HTML.
So unfortunately, I can't give you a simple answer to that.

[Firefox Wins]

Got it, DIY & experiments are the best way to learn anyway.
You have shared before that php is sometimes slower than template variables, so by now I should stop looking for an easy way to avoid fully understanding the template system,
html here ---> code here (duh)
I'm familiar with several options, often too many options, thanks.

[ZiNgA BuRgA]

PHP in templates is slower, but PHP itself is probably faster than the templates system.  Either case, I don't think it's that much of an issue unless you expect lots and lots of requests that your server has trouble keeping up.