Trying to get this template engine working properly

[scottybwoy]

Hi all,

 

I'm working with with this basic framework tutorial but try as I might, I can't seem to get the templating system working properly.  I'm only trying the basics first.  Here's what I have.

 

Initialisation page :

<?php

require_once 'central.php';

class Page extends SystemBase {
function init() {
	$this->page->set('title', 'I Say Union, You Say Onion');
	$this->page->set("right_bar", include_once(LOGIN_PAGE));
}
}

$p = new Page();

?>

This calls the base class, this is just the constructor and the print function :

<?php
class SystemBase {
    /*Local Atributes**********************************************/
    var $db   = null;        // pointer to DB object
    var $user = null;        // pointer to user object
    var $page = null;        // pointer to a page template
    var $form = null;        // pointer to form object

    var $template = '';      // path to page template

    /*Constructor/Destructor***************************************/
    function __construct($template='home.php') {
        //prevent instantionation of this class (force abstract)
        if (!is_subclass_of($this,'SystemBase')) {
		trigger_error('Base instantiation from non subclass',E_USER_ERROR);
            return NULL;
        }
        
        //initialize attributes
        if (!defined('NO_DB')) {
        	$this->db = new db();
        	$this->user = new User($this->db);
        }

        $this->page = new Template(TEMPLATE_PATH);

        $this->template = $template;

        //run the page using abstract methods
        $this->init();
        $this->authenticate();

        if (!is_null($this->form)) {
        	$this->handleFormEvents();
        }

        if (!defined('NO_PRINT')) {
        	$this->printPage();
        }

        $this->destroy();
    }

    function printPage() {      //abstract
        if (!is_null($this->form)) {
        	$forms = $this->form;

        	foreach ($forms as $form => $v) {
        		$content = $forms->$form->DisplayForm();
            	$this->page->set($form, $content);
        	}
        }

        echo $this->page->fetch($this->template);
    }
}
?>

And finally the template class, just the two main methods I'm using :

<?php
class Template { 
  var $vars; // Holds all the template variables
  var $path; // Path to the templates 

  function __construct($path = null) { 
    $this->path = $path; 
    $this->vars = array(); 
  } 

  function set($name, $value) { 
    $this->vars[$name] = $value; 
  } 

  function fetch($file) { 
    extract($this->vars);     // Extract the vars to local namespace 
    ob_start();          // Start output buffering 
    include($this->path . $file); // Include the file 
    $contents = ob_get_contents(); // Get the contents of the buffer 
    ob_end_clean();        // End buffering and discard 
    return $contents;       // Return the contents 
  } 
} 
?>

 

In my home.php template I have a placeholder <?=$right_bar?>.  And want the login script to go in there, but it doesn't want to.  What I have on my screen instead is the login.php script followed by the home.php page, without any of the placeholders replaced.  Can anyone see why that is?  Is the systemBase class __constructor written wrong and should not call the the printPage method unless no page is set?

 

Hope this makes sense, thanks.