call to non-member function - need help!!

[appleifreak]

Okay so I am pretty new to OOP in PHP (used to php4) and I understand that you need some $this in front of other stuff, however I don't use any functions in my function, yet it still doesn't work. Here's the code:

Library function:

function navBar($thisLink,$thatLink,$nav = array()) {
        $CI =& get_instance();
        
        $string = '';
        $baseUrl = 'http://rpg.antiradiant.com/';
    
        if ($thisLink != $thatLink) {
            $string .= '<a href="'.$thatLink.'" class="navAnchor"><img width="170" height="35" src="'.$baseUrl.'media/images/UI/nav/profile/off.jpg" srcover="'.$baseUrl.'media/images/UI/nav/profile/hov.jpg" srcdown="'.$baseUrl.'media/images/UI/nav/profile/on.jpg"/></a>';
        } else {
            $string .= '<table border="0" cellpadding="0" cellspacing="0">
                <tr>
                    <td><a href="'.$thisLink.'" class="navAnchor"><img width="170" height="30" src="'.$baseUrl.'media/images/UI/nav/hangar/slct_top.jpg"/></a></td>
                </tr>';
            if (count($nav) > 0) {
                $string .= '<tr>
                    <td class="navMore">
                    <table border="0" cellpadding="0" cellspacing="0">
                        <tr>
                            <td width="30">&nbsp;</td>';
                foreach ($nav as $row) {
                    $string .= '<td><a href="'.$row['anchor'].'">'.$row['link'].'</a></td>';
                }
                $string .= '<td width="30">&nbsp;</td>
                        </tr>
                    </table></td>
                </tr>';
            }
                
            $string .= '<tr>
                    <td><img width="170" height="10" src="'.$baseUrl.'media/images/UI/nav/slct_bot.jpg"/></td>
                </tr>
                </table>';
        };
        
        return $string;
    } 

controller function:

function index()
    {
        $this->load->view('test');
    } 

view file:

$navInfo = array(
    1 => array(
        'anchor' => 'profile',
        'link'   => 'Profile' 
    ),
    2 => array(
        'anchor' => 'alliance',
        'link'   => 'Alliance' 
    )
);

echo $this->ui->navBar('profile','profile',$navInfo); // THIS IS LINE 13 

BTW, this is built in the framwork CodeIgniter and they were of no help what so ever. The error is:

Fatal error: Call to a member function navBar() on a non-object in /nfs/c02/h07/mnt/XXXXX/domains/aPlace.antiradiant.com/html/system/application/views/test.php on line 13

[Alan]

Ok just a few basics.

A class is a blueprint of an object. It defines the attributes and methods of an object. An instance of a class is when you take that class and build an object from it.

e.g.

$alan = new Person(); 

The $this variable is a reference to the object you are working with. Because it references an object, you need to instanciate the class first. The "->" operator is an identifier that links an object to it's classes' properties.

e.g.

$alan->name = "Alan";

if($alan->is_cool())
   echo "Alan is a very cool guy!";

class Person
{
    public $name;
    public $cool;

    // Other code in here. This is only an example

   public function is_cool()
   {
      if($this->cool)
         return true;
      else
      {
         $this->cool = true;
         $this->is_cool();
      }
   }
} 

Now that that is out of the way, I believe your problem is line 13 (as you said).

echo $this->ui->navBar('profile','profile',$navInfo); // THIS IS LINE 13

So in this line you are saying that the current object ($this), has an object attribute called $ui, which has a function in it's class called navBar.

I'm not really sure what your class names are so, ill just give you another example.

class Page
{
   private $database; // Stores a database object

   public $title;
   public $content;

   public class __construct($title)
   {
      global $database;
      $this->database = $database;

      $this->title = $title;

      $this->get_content(); // Get the page content from the database
   }

   private function get_content()
   {
      $title = $this->database->make_safe($title);

      $query = "Select content From pages Where title='$title'";
      if($result = $this->database->query($query))
      {
           $result->fetch_assoc();
           $this->content = $result['content'];
      }
      else
          return false;
   }
}

// Global Scope

$database = new Database($host,$user,$pass,$name);

$mypage = new Page('Home'); 

I'm probably going into too much depth here, but as you can see the database object is stored in the page class. The $this variable references the class in the current scope.

I'm not sure of your class names and such but I think the proper line of code is this:

echo $this->navBar('profile','profile',$navInfo); // THIS IS LINE 13 

If you have any questions, ask away.