<?
class plantilla{
var $_tpldata = array();

		/* Pasamos el nombre de la variables sin su extención */
        function plantilla($template_file){
                $this->jnt_file = 'themes/yellow/' . $template_file . '.jnt';
        }
        
		/* Resibe la variable */
        function asigna_variables($vars){
                $this->vars= (empty($this->vars)) ? $_vars : $this->vars . $vars;
				echo  $vars[2];
        }
        
	/*extraido de phpbb2, funcion para una consulta SQL */
	function assign_block_vars($vararray)
	{
		$blockname = $this->jnt_file;
		reset($this);
		if (strstr($blockname, '.'))
		{
			// Nested block.
			
			$blocks = explode('.', $blockname);
			$blockcount = sizeof($blocks) - 1;
			$str = '$this->_tpldata';
			for ($i = 0; $i < $blockcount; $i++)
			{
				$str .= '[\'' . $blocks[$i] . '.\']';
				eval('$lastiteration = sizeof(' . $str . ') - 1;');
				$str .= '[' . $lastiteration . ']';
				
			}
			// Now we add the block that we're actually assigning to.
			// We're adding a new iteration to this block with the given
			// variable assignments.
			$str .= '[\'' . $blocks[$blockcount] . '.\'][] = $vararray;';

			// Now we evaluate this assignment we've built up.
			eval($str);
		}
		else
		{
			// Top-level block.
			// Add a new iteration to this block with the variable assignments
			// we were given.
			$this->_tpldata[$blockname . '.'][] = $vararray;
		}

		return true;
	}


	 /* Funcion encargada de cargar el archivo para ser mostrado */
	 function loadfile($handle)
	{
		 $handle = "body.jnt";
		// If the file for this handle is already loaded and compiled, do nothing.
		if (isset($this->uncompiled_code[$handle]) && !empty($this->uncompiled_code[$handle]))
		{
			return true;

		}

		// Si el archivo no existe.
		//echo "<b>$this->files[$handle]</b><br>";
		if (!isset($this->files['themes/yellow/body.jnt']))
		{
			die("Template->loadfile(): No file specified for handle $handle");
		}

		$filename = $this->files[$handle];

		$str = implode("", @file($filename));
		if (empty($str))
		{
			die("Template->loadfile(): File $filename for handle $handle is empty");
		}

		$this->uncompiled_code[$handle] = $str;

		return true;
	}

	function pparse()
	{
		$handle=$this->jnt_file;
		//echo $handle;
		if (!$this->loadfile($handle))
		{
			die("Template->pparse(): Couldn't load template file for handle $handle");
		}

		// actually compile the template now.
		if (!isset($this->compiled_code[$handle]) || empty($this->compiled_code[$handle]))
		{
			// Actually compile the code now.
			$this->compiled_code[$handle] = $this->compile($this->uncompiled_code[$handle]);
		}

		// Run the compiled code.
		eval($this->compiled_code[$handle]);
		return true;
	}

}
?>

<?
$jnt_template=new plantilla("body");

//assign_block_vars
$resp = mysql_query("select * FROM categorias ORDER BY c_id") ;
while($datos = mysql_fetch_array($resp))
{
	//$jnt_template->assign_block_vars('body',array
	$jnt_template->assign_block_vars(array
	(
		'SECCION_N' => $datos['nombre'],
		'DESCRIPCION' => $datos['descripcion']
	));

};
	//$ContenidoString = $jnt_template->muestra();
	//echo $ContenidoString;
	$jnt_template->pparse();
mysql_free_result($resp) ;
mysql_close($conectar) ;

?>

Template->loadfile(): No file specified for handle body.jnt