PHP - Classes Related Error

Hello again!

I've been trying out new things (well, new for me) in php again.  This time I decided to try a real challenge and make a forum system.  A friend suggested I use a class for all database functionalities.  i was reluctant at first, but decided if I was going to try using classes for the first time, it might as well be with this.  With some guiding help, I set up the files and gave it a visual once over to check for errors.  Nothing seemed out of place, but when I loaded the page to try it out, I got this error:

Quote

Fatal error: Call to a member function query() on a non-object in /home/ck9/public_html/planning/forumbuild/list.php on line 20



I didn't see anything out of line, so I consulted my friend about it.  He made a few small adjustment suggestions, but nothing fixed the issue.  I then bugged my host about it, and he couldn't find anything wrong either.  Both people are highly experienced in php, so when they say it SHOULD be working I am left rather confused.

Here is list.php:
Code: [Select]
<?php
 include("db.class.php");
 include("db.config.php");

 $db = new databaseConnection($config['user'],$config['pass'],$config['database']);
 $g = $_GET['g'];
 $s = $_GET['s'];
 $t = $_GET['t'];

 function tablestart($a = '1')
  {
   global $db;

   echo "<table border='" . $a . "' cellpadding='10' cellspacing='0' align='center' width='80%' style='color: #C0C0C0'>\n";
  }
 function contents($table, $a, $b = '1', $c = '1')
  {
   global $db;

   $db->query("SELECT * FROM $table");

   while($row = $db->fetch_array())
    {
     if($row['level'] <= $_SESSION['ulevel'])
      {
       echo "<tr><td width='5%'><!--indicator--></td><td width='80%'><a href='index.php?pg=h&g='" . $row['g'];
       if(($a > '1') && ($row['g'] == $b))
        {
         echo "&s=" . $row['s'];
         if(($a > '2') && ($row['s'] == $c))
          {
           echo "&t=" . $row['t'];
          }
        }
      }
     echo "' style='color: #C0C0C0 ; text-decoration: none'><font size='4'>" . $row['name'] . "</font><br /><fpnt size='3'>" . $row['desc'] . "</td><td width='15%'><!--last update--></td></tr>\n";
    }
  }

 if(empty($_SESSION['ulevel']))
  {
   $_SESSION['ulevel'] = '0';
   echo "<font color='#CC0000'><center>You need to register to post in these forums.</center></font><br />\n";
  }

 if(empty($g))
  {
   tablestart();
   contents('group', '1');
   echo "</table>\n";
  }
 elseif(empty($s))
  {
   tablestart();
   contents('section', '2', $g);
   echo "</table>\n";
  }
 elseif(empty($t))
  {
   tablestart('0');
   echo "<tr><td width='80%'></td><td><!--new topic--></td></tr>\n</table>\n";
   tablestart();
   contents('topic', '3', $g, $s);
   echo "</table>\n";
  }
 elseif(!empty($t))
  {
   tablestart('0');
   echo "<tr><td width='80%'></td><td><!--new topic and reply--></td></tr>\n</table>\n";
   $data = file_get_contents('topics/g' . $g . 's' . $s . 't' . $t . '.txt');
   $post = explode("<!--p-->", $data);
   $length = count($post);
   tablestart('1');
   for($z = '0'; $z < $length; $z ++)
    {
     $i = '0';
     $cont = explode("<!--e-->", $post[$pos]);
     echo "<tr><td><b>" . $cont[$i] . "</b><br /><!--future additions--></td><td>\n<table width='100%' style='font-size: xx-small'>\n<tr><td height='3' width='75%'>";
     $i ++;
     echo "Posted on" . $cont[$i] . "</td><td height='3' width='25%'><!--future additions--></td></tr><tr><td width='100%'>";
     $i ++;
     echo $cont[$i] . "</td></tr></table></td></tr>\n";
    }
   echo "</table>\n";
  }
?>
My aim here was to have a single page to display the groups, sections, topics, and posts in order to keep database calls where I could find them easily.

and here is the class file:

Code: [Select]
<?php
class databaseConnection
 {
  protected $link;
  protected $lastResult;
  function databaseConnection($user,$pass,$database)
   {
    $this->link = mysql_connect("localhost",$user,$pass);
    if( !$this->link )
     {
      die('Vital information missing.');
     }
    else
     {
      mysql_select_db($database,$this->link) or die('could not find database: ' . mysql_error());
     }
   }
  function query($query)
   {
    $this->lastresult = mysql_query($query) or die('MySQL error: ' . mysql_error());
    return $this->lastresult;
   }
  function fetch_array($result = false)
   {
    if(!$result)
     {
      return mysql_fetch_array($this->lastresult);
     }
    else
     {
      return mysql_fetch_array($result);
     }
   }
 }
?>
I have tried everything from adjusting the php tags to putting the class directly in the page.

The config file just provides the user, pass, and which database to connect to.  I've checked it's formatting a few times just in case.