global_bootstrap_init_start code causing 301 redirects

[sacobra]

The mod does not work as is. And developer has stopped supporting. So I have customised it to work for my site.

I tested & figured out that whatever I add in the global_bootstrap_init_start get appended in the home page URL.
For e.g:

PHP Code:

$engage_callback = $vbulletin->input->clean_gpc('g', 'engage_callback', TYPE_INT);
$add_engage_identifier = $vbulletin->input->clean_gpc('g', 'add_engage_identifier', TYPE_INT); 


Leads to URL being /?engage_callback&add_engage_identified=0

If I change it to

PHP Code:

$engage_callback = $vbulletin->input->clean_gpc('g', 'testing', TYPE_INT); 


The URL becomes /?testing=0
That is if I change the get variable to something that I'm not using in the rest of the code.

I have checked if the php variable $engage_callback has any effect. But it does not. I can change the php variable to whatever I want and there is no change in the the behaviours.

What I see in the Page Source is that the javascript code embedded in it is

var RELPATH = "?add_engage_identifier=0";

instead of

var RELPATH = "";

How does the

PHP Code:

$vbulletin->input->clean_gpc('g', 'add_engage_identifier', TYPE_INT) 


results in the RELPATH variable being filled?

--------------- Added [DATE]1332649890[/DATE] at [TIME]1332649890[/TIME] ---------------

And I tried disabling a few plugins that I have to isolate the problem and it doesn't seem to be due to any of them.