Example 3 for Formatter

class-lister.php

<?php
require_once 'class-formatter.php';
require_once 'class-templates.php';

interface Templates
{
	public function get_templates();
}

class Lister extends Formatter
{	
	public $templates_object = NULL;
	
	public $templates = array();

	public function __construct( Templates $templates ){
		
		$this->templates_object = &$templates;
		
		$this->get_templates();
		
	}
	protected function get_templates(){

		if( NULL === $this->templates_object )
			throw new Exception( 'No templates defined' );
			
		$this->templates = &$this->templates_object->get_templates();

	}
	
	public function get_list( $type = '', $data = array() ){
	
		// get templates if not already set
		if( empty( $this->templates ) )
			$this->get_templates();

		// check if the requested list-typ is defined
		if( ! in_array( $type, array_keys( $this->templates ) ) )
			return FALSE;
		
		// create list
		$inner	= new stdClass();
		$values	= new stdClass();
		
		foreach( $data as $key => $value ){
				
			$values->key	= $key;
			$values->item 	= $value;
			
			$inner->inner .= self::sprintf( $this->templates[$type]['inner'], $values );
		}
		
		return self::sprintf( $this->templates[$type]['outer'], $inner );
		
	}

}

$data = array( 'Eins', 'Zwei', 'Drei' );

$list = new Lister( new Simple_List_Templates );

echo $list->get_list( 'ol', $data );
echo $list->get_list( 'ul', $data );
echo $list->get_list( 'div', $data );

class-templates.php

<?php
class Simple_List_Templates implements Templates
{
	public function get_templates(){

		return array(
			'ol'	=> array(
						'outer'	=> "<ol>\n%inner%</ol>\n",
						'inner'	=> "<li>%item%</li>\n"
			),

			'ul'	=> array(
						'outer'	=> "<ul>\n%inner%</ul>\n",
						'inner'	=> "<li>%item%</li>\n"
			),

			'div'	=> array(
						'outer'	=> "<div>\n%inner%</div>\n",
						'inner'	=> "<p>%item%</p>\n"
			),
		);
	
	}
}