include .php file in templates

[Logikos]

I've created a .php file that outputs HTML. What i would like to do is ad a $ call in the templates, and have it pull only the HTML file of the .php file i created.

I've tried

PHP Code:

if ($html)
{
        include('./myfile.php');
} 


I even tried lol

PHP Code:

eval('$html = "' . include "myfile.php" . '";'); 


And use $html in the templates but i get nothing. Any ideas what i could use?