Help -- (Topic Extraction) all links lead to the same topic

<?php
## Mod Title: Topic Extraction
## Version: 1.5.2

#############
## Edit Below
#############
// Where to take the topics from
// Always a number
$forum = '1';

// How many topics to show
$limit = '5';

// How to show the topics
// full or blank ('')
$show = '';

// How to display the date and time if used
// short or long
$date_time = 'long';

// How top display the topic link if usede
// topic or phpbb
$topic_link = 'phpbb';

// Comments link - how to send them to comments
// topic or reply
$comment = 'topic';

// Path to your forums directory
// Usually ./forum/ or ./phpBB/ or ./forums/
$phpbb_root_path = './phpbb/';

#############################################
## No Editing unless you know what your doing
#############################################
if ( !defined('IN_PHPBB') )
{
  define('IN_PHPBB', true);
  include($phpbb_root_path  . 'extension.inc');
  include($phpbb_root_path  . 'common.'.$phpEx);
  include($phpbb_root_path  . 'config.'.$phpEx);
}

if ($show == '' || $show == 'full')
{
   // Select the topic information from the correct forum and set it to $grab_topics
   $grab_topics = $db->sql_query("SELECT * FROM `{$table_prefix}topics` WHERE `forum_id` = '{$forum}' AND `topic_moved_id` = '0' ORDER BY `topic_id` DESC LIMIT {$limit}");
}

else if ($show == 'topic')
{
   $grab_topics = $db->sql_query("SELECT * FROM `{$table_prefix}topics` WHERE `forum_id` = '{$forum}' AND `topic_id` = '{$_GET['t']}' ORDER BY `topic_id` DESC");
}
   
// Grab the information using an array and set it to $echo_topic
while ($echo_topic = $db->sql_fetchrow($grab_topics))
{
   // Select the post information from the correct forum and set it to $grab_posts
   $grab_posts = $db->sql_query("SELECT * FROM `{$table_prefix}posts` WHERE `forum_id` = '{$forum}' AND `topic_id` = '{$echo_topic['topic_id']}' LIMIT 1");
   
   // Grab the information using an array and set it to $echo_post
   while ($echo_post = $db->sql_fetchrow($grab_posts))
   {
      // Now get the post_text using the post_id were looking at and sort it info $grab_posts_text
      $grab_posts_text = $db->sql_query("SELECT * FROM `{$table_prefix}posts_text` WHERE `post_id` = '{$echo_post['post_id']}'");
     
      // Grab the information using an array and set it to $echo_text
      while($echo_text = $db->sql_fetchrow($grab_posts_text))
      {
         // Find the user the posted
         $find_user = $db->sql_query("SELECT * FROM `{$table_prefix}users` WHERE `user_id` = '{$echo_post['poster_id']}'");
         
         // Sort this users info into array for the post
         while ($echo_user = $db->sql_fetchrow($find_user))
         {
               
            // Get rid of all those annoying characters from bbcode
            $echo_text = preg_replace('/\:[0-9a-z\:]+\]/si', ']', $echo_text);   
           
            // BBCode
            $echo_text = str_replace("[b]","<strong>",$echo_text);
            $echo_text = str_replace("[/b]","</strong>",$echo_text);
               
            $echo_text = str_replace("[i]","<em>",$echo_text);
            $echo_text = str_replace("[/i]","</em>",$echo_text);
               
            $echo_text = str_replace("[u]","<u>",$echo_text);
            $echo_text = str_replace("[/u]","</u>",$echo_text);
               
            $echo_text = preg_replace('/\[quote=(.*)\](.*)\[\/quote\]/Usi','<div style=\"padding: 7px\">$2</div>',$echo_text);
           
            $echo_text = str_replace("[quote]","<strong>Quote</strong><em>",$echo_text);
            $echo_text = str_replace("[/quote]","</em>",$echo_text);
               
            $echo_text = str_replace("[code]","<strong>Code</strong><em>",$echo_text);
            $echo_text = str_replace("[/code]","</em>",$echo_text);
               
            $echo_text = preg_replace('/\[list\](.*)\[\/list\]/si',"<div style=\"padding: 7px\">$1</div>",$echo_text);
            $echo_text = preg_replace('/\[list=(.*)\](.*)\[\/list\]/si',"<div style=\"padding: 7px\">$1</div>",$echo_text);
               
            $echo_text = str_replace("[img]","<img src=\"",$echo_text);
            $echo_text = str_replace("[/img]","\" alt=\"image\" />",$echo_text);
               
            $echo_text = preg_replace('/\[url\](.*)\[\/url\]/Usi','<a href="$1">$1</a>',$echo_text);
            $echo_text = preg_replace('/\[url=(.*)\](.*)\[\/url\]/Usi','<a href="$1">$2</a>',$echo_text);
           
            $echo_text = preg_replace('/\[color=(.*)\](.*)\[\/color\]/Usi','<span style="{color:$1}">$2</span>',$echo_text);
            $echo_text = preg_replace('/\[size=(.*)\](.*)\[\/size\]/Usi','<span style="{font-size:$1pt}">$2</span>',$echo_text);
               
            $echo_text = str_replace("\n", "\n<br />\n", $echo_text);
               
            // Way to display date and time
            // long
            if($date_time == "long")
            {
               $echo_topic['topic_time'] = strftime("%A %e %B %H:%M",$echo_topic['topic_time']);
            }
               
            // short
            if ($date_time == "short")
            {
               $echo_topic['topic_time'] = strftime("%a %e %b %H:%M",$echo_topic['topic_time']);
            }
               
            // Way to display comment link
            // Go right to the topic
            if ($comment == 'topic')
            {
               $comment_link = "{$phpbb_root_path}viewtopic.php?t={$echo_topic['topic_id']}";
            }
           
            // Go right to the reply box
            if ($comment == 'reply')
            {
               $comment_link = "{$phpbb_root_path}posting.php?mode=reply&t={$echo_topic['topic_id']}";
            }
           
            // Topic link types
            // This link goes to the topic display
            if ($topic_link == 'topic')
            {
               $topic_link = "?show1=topic&t={$echo_topic['topic_id']}";
            }
           
            // This link goes to the actual phpbb topic
            if ($topic_link == 'phpbb')
            {
               $topic_link = "{$phpbb_root_path}viewtopic.php?t={$echo_topic['topic_id']}";
            }
           
            ##################################
            ## Edit for look and feel of topic
            ##################################
            // Display just the title
           
            if ($show != 'full' && !isset($_GET['show1']))
            {
               echo "<a href='{$topic_link}'>{$echo_text['post_subject']}</a><br />";
            }
           
            // Display many topics - for news, shoutbox etc
            else if ($show == 'full')
            {
               echo "
               <strong>{$echo_text['post_subject']}</strong> by <strong>{$echo_user['username']}</strong> at <strong>{$echo_topic['topic_time']}</strong>
               <br />
               <br />
               {$echo_text['post_text']}
               <br />
               <br />
               <a href=\"{$comment_link}\">Comments {$echo_topic['topic_replies']}</a>
               <hr size=\"1\">
               ";
            }
           
            // Display the topic for when used with the one above, click link and go here
            if ($_GET['show1'] == 'topic')
            {
               echo "
               <strong>{$echo_text['post_subject']}</strong> by <strong>{$echo_user['username']}</strong> at <strong>{$echo_topic['topic_time']}</strong>
               <br />
               <br />
               {$echo_text['post_text']}
               <br />
               <br />
               <a href=\"{$comment_link}\">Comments {$echo_topic['topic_replies']}</a>
               <hr size=\"1\">
               ";
            }
         }
      }
   }   
}
?>

$topic_link = 'phpbb';

$topic_link_type = 'phpbb';

            if ($topic_link == 'topic')

            if ($topic_link == 'phpbb')