new bbcode tag

[IranDelphi]

hi
I need to have the access to the variant that when a user enteres a text in tag or [php] tag. Please tell me that how these parameters are sent to the server? for example $code or $tetx?
Would you please tell me the address page of the vbulletin source page?

I want to edit the sent text to my personal tag, please help me !

for example when a user writes :

[code]
abcdef....


I want to change it to :
$code = geshi($code , 'delphi');
echo $code;

Unfortunately your representative in Iran does'nt support us well!!!!!
I have sent him many e-mails but I haven't got any answer yet!!!
Waitnig for your kind reply very soon.
Best Regards
Babak Ahadi