vb.org Archive - How can I get the threadid?

I'm trying to change the URL's for forums and threads in an effort to make them more friendly to search engines like Google. I know there are several hacks with a rather different way of doing this, but I'm giving this method a shot. Right now I'm working on displaying threads by changing the normal URL (http://www.domain.com/forum/showthread.php?s=&threadid=123) to the new one (http://www.domain.com/forum/thread/123). I've almost got it working - here's what I've done so far:

- - - - - - - - - -

1. Created a copy of showthread.php and named the new file simply "thread" without any extension.

2. I then uploaded a .htaccess file in my forum directory containing the following (which will cause Apache to read the new "thread" file as a PHP script).

Code:

<Files thread> 

ForceType application/x-httpd-php 

</Files>

3. And, finally, in this new "thread" file, I've added these two lines (which I found from a post on the vB.com forums, they are highlighted in orange) at the very beginning of the file.

Code:

<?php



error_reporting(7);



$url_array=explode("/",$PATH_INFO); 

$threadid=$url_array;

$action = $HTTP_GET_VARS['action'];

$goto = $HTTP_GET_VARS['goto'];



if ( isset($goto) and ($goto=='lastpost' or $goto=='newpost')) {

  $noheader=1;

}

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After I perform the modifications above, I am able view a thread by using the new URL (http://www.domain.com/forum/thread/123). However, it will *only* show me the first thread on the forum (with a threadid of 1). I know the problem lies in the $threadid=$url_array; line, but I don't know what to change it to to fix it so that it will display whatever threadid number I specify in the URL. How should I change that line to achieve the desired effect?

X vBulletin 3.8.12 by vBS Debug Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (2)bbcode_code_printable (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (6)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages:

X vBulletin 3.8.12 by vBS Debug Information

Page Generation 0.01024 seconds
Memory Usage 1,727KB
Queries Executed 10 (?)

More Information

Template Usage:

(1)ad_footer_end
(1)ad_footer_start
(1)ad_header_end
(1)ad_header_logo
(1)ad_navbar_below
(2)bbcode_code_printable
(1)footer
(1)gobutton
(1)header
(1)headinclude
(6)option
(1)post_thanks_navbar_search
(1)printthread
(6)printthreadbit
(1)spacer_close
(1)spacer_open

Phrase Groups Available:

global
postbit
showthread

Included Files:

./printthread.php
./global.php
./includes/init.php
./includes/class_core.php
./includes/config.php
./includes/functions.php
./includes/class_hook.php
./includes/modsystem_functions.php
./includes/class_bbcode_alt.php
./includes/class_bbcode.php
./includes/functions_bigthree.php

Hooks Called:

init_startup
init_startup_session_setup_start
init_startup_session_setup_complete
cache_permissions
fetch_threadinfo_query
fetch_threadinfo
fetch_foruminfo
style_fetch
cache_templates
global_start
parse_templates
global_setup_complete
printthread_start
bbcode_fetch_tags
bbcode_create
bbcode_parse_start
bbcode_parse_complete_precache
bbcode_parse_complete
printthread_post
printthread_complete

Messages:

X vBulletin 3.8.12 by vBS Debug Information
Page Generation 0.01024 seconds Memory Usage 1,727KB Queries Executed 10 (?)
More Information
Template Usage: (1)ad_footer_end (1)ad_footer_start (1)ad_header_end (1)ad_header_logo (1)ad_navbar_below (2)bbcode_code_printable (1)footer (1)gobutton (1)header (1)headinclude (6)option (1)post_thanks_navbar_search (1)printthread (6)printthreadbit (1)spacer_close (1)spacer_open Phrase Groups Available: global postbit showthread	Included Files: ./printthread.php ./global.php ./includes/init.php ./includes/class_core.php ./includes/config.php ./includes/functions.php ./includes/class_hook.php ./includes/modsystem_functions.php ./includes/class_bbcode_alt.php ./includes/class_bbcode.php ./includes/functions_bigthree.php Hooks Called: init_startup init_startup_session_setup_start init_startup_session_setup_complete cache_permissions fetch_threadinfo_query fetch_threadinfo fetch_foruminfo style_fetch cache_templates global_start parse_templates global_setup_complete printthread_start bbcode_fetch_tags bbcode_create bbcode_parse_start bbcode_parse_complete_precache bbcode_parse_complete printthread_post printthread_complete
Messages: