What happen to PHP_include Start When I upgraded

[Goat Boy]

I upgraded from 3.0.7 to 3.6.4

I had info in there for an ad banner

include ('ad_network_405.php');

I am not sure where to put this now. My ads are not working

[Reeve of shinra]

PHP_include has been replaced with the plugin system

go to admincp -> Plugin System -> Add New Plugin

Hook Location: Global Start
Title: Whatever
PHP Code: Your code here

[Goat Boy]

Like this


ob_start();
include('path to/forums/ad_network_405.php');
$includedphp = ob_get_contents();
ob_end_clean();

I got that far, how do I figure out what the path to is. When I log in to ftp the directory starts at public_html, so I tried
include('public_html/forums/ad_network_405.php'); and it didn't work no such directory. How do I figure out my path to?