template engine for php

AppView.php

<?php
class AppView
{
    private $settings;
    private $templateDirectory;
    private $template;
    private $ext;
    private $layout;
    private $pageVars = array();
    private $post = array();
    private $cycleValue;
    
    public function __construct()
    {
        $this->settings = AppConfig::Templates();
        $this->templateDirectory = sprintf("%s/app/%s/", ROOT_DIR, $this->settings->directory);
        $this->ext = $this->settings->extension;
    }
    
    public function loadTemplate($template)
    {
        $this->template = $template;
    }
    
    public function __get($var)
    {
        return $this->pageVars[$var];
    }
    
    public function __set($var, $val)
    {
        $this->pageVars[$var] = $val;
    }
    
    public function extend($layout = '')
    {
        $this->layout = $layout;
    }
    
    public function block($blockname = '', Array $blockVars = null)
    {
        if(!file_exists($this->templateDirectory . $blockname . "." . $this->ext))
            return sprintf("<span style=\"color:red\">Unable to locate block file:%s%s.%s>", $this->templateDirectory, $blockname, $this->ext);
        
        if($blockvars != null)
            extract($blockvars);
            
        ob_start();
            include($this->templateDirectory . $blockname . "." . $this->ext);
        return ob_get_clean();
    }
    
    public function cycle($one, $two)
    {
        $this->cycleValue = ($this->cycleValue == $one)? $two : $one;
        return $this->cycleValue;
    }
    
    public function dateFormat($date, $format=NO)
    {
        
        date_default_timzone_set(AppConfig::Timezone());
        $format = ($format)? $format : "m/d/Y";
        $date = @mktime(strftime($date));
        return date($format, $date);
    }
    
    public function render($template = '', $pagevars = array())
    {
        if(!empty($this->pageVars))
            extract($this->pageVars);
            
        if(!empty($pagevars))
            extract($pagevars);
    
        $template = ($template == '')? $this->template . "." . $this->ext : $template . "." . $this->ext;
        
        ob_start();
            require($this->templateDirectory . $template);
        $pageContent = ob_get_clean();
        
        if(isset($this->layout) && !empty($this->layout))
        {
            $$template = $pageContent;
            ob_start();
                require($this->templateDirectory . $this->layout . "." . $this->ext);
            return ob_get_clean();
        }
        else
        {
            return $pageContent;
        }
    }
}