Design pattern Visiteur en php (http://kandran.fr/design-pattern-visiteur)

ConfigDocument.php

<?php

require_once('Document.php');

class ConfigDocument extends Document
{
}

Document.php

<?php
require_once('IDocumentRenderer.php');
class Document
{
    protected $data = array();
    public function setData(array $data)
    {
        $this->data = $data;
    }
    
    public function accept(IDocumentRenderer $renderer)
    {
        $renderer->visit($this);
    }

    public function getData()
    {
        return $this->data;
    }
}

DocumentRenderer.php

<?php
require_once('IDocumentRenderer.php');
abstract class DocumentRenderer implements IDocumentRenderer
{
    protected $output;
    public function getOutput()
    {
        return $this->output;
    }
}

HtmlRenderer.php

<?php
require_once('DocumentRenderer.php');
class HtmlRenderer extends DocumentRenderer
{
    public function visit(Document $document)
    {
        $data = $document->getData();
        $this->output = "<table>";
        foreach ($data as $key => $value) {
            $this->output .= "<tr><td>$key</td><td>$value</td></tr>";
        }
        $this->output .= "<table>";
    }
}

IDocumentRenderer.php

<?php
require_once('Document.php');
interface IDocumentRenderer
{
    public function visit(Document $document);
}

TextRenderer.php

<?php
require_once('DocumentRenderer.php');
class TextRenderer extends DocumentRenderer
{
    public function visit(Document $document)
    {
        $data = $document->getData();
        $this->output = "";
        foreach ($data as $key => $value) {
            $this->output .= "$key:$value\n";
        }
    }
}

visitor.php

<?php
require_once('ConfigDocument.php');
require_once('HtmlRenderer.php');
require_once('TextRenderer.php');
require_once('XMLRenderer.php');

function render($doc, $renderer)
{
    $doc->accept($renderer);
    return  htmlentities($renderer->getOutput());
}

$doc = new ConfigDocument();
$doc->setData(array(
    "key1" => "value1",
    "key2" => 5
    ));
$htmlRenderer = new HtmlRenderer();
echo "<br/><br/>html <br/>" . render($doc, $htmlRenderer);

$textRenderer = new TextRenderer();
echo "<br/><br/>text <br/>" . render($doc, $textRenderer);

$xmlRenderer = new XmlRenderer();
echo "<br/><br/>xml <br/>"  . render($doc, $xmlRenderer);

XmlRenderer.php

<?php
require_once('DocumentRenderer.php');
class XmlRenderer extends DocumentRenderer
{
    public function visit(Document $document)
    {
        $data = $document->getData();
        $this->output = "<items>";
        foreach ($data as $key => $value) {
            $this->output .= "<item key='$key'>$value</item>";
        }
        $this->output .= "<items>";
    }
}