Source for file HTMLtoXHTML.php

Documentation is available at HTMLtoXHTML.php
<?php
/**
 * $Id: HTMLtoXHTML.php,v 1.4 2007/12/01 22:00:19 dufuz Exp $
 * Demonstrates conversion of HTML to XHTML
 */
require_once 'XML/HTMLSax3.php';
 
class HTMLtoXHTMLHandler
{
    var $xhtml;
    var $inTitle;
    var $pCounter;
 
    function HTMLtoXHTMLHandler()
    {
        $this->xhtml = '';
        $this->inTitle = false;
        $this->pCounter = 0;
    }
 
    // Handles the writing of attributes - called from $this->openHandler()
    function writeAttrs ($attrs)
    {
        if (is_array($attrs)) {
            foreach ($attrs as $name => $value) {
                // Watch for 'checked'
                if ($name == 'checked') {
                    $this->xhtml.=' checked="checked"';
                // Watch for 'selected'
                } else if ($name == 'selected') {
                    $this->xhtml.=' selected="selected"';
                } else {
                    $this->xhtml.=' '.$name.'="'.$value.'"';
                }
            }
        }
    }
 
    // Opening tag handler
    function openHandler(&$parser, $name, $attrs)
    {
        if ((isset($attrs['id']) && $attrs['id'] == 'title') || $name == 'title') {
            $this->inTitle = true;
        }
 
        switch ($name) {
            case 'input':
                $this->xhtml .= '<input';
                $this->writeAttrs($attrs);
                $this->xhtml .= " />\n";
                break;
            case 'img':
                $this->xhtml .= '<img';
                $this->writeAttrs($attrs);
                $this->xhtml .= " />\n";
                break;
            case 'br':
                $this->xhtml .= "<br />\n";
                break;
            case 'html':
                $this->xhtml .= "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"eng\">\n";
                break;
            case 'p':
                if ($this->pCounter != 0) {
                    $this->xhtml.="</p>\n";
                }
                $this->xhtml .= '<p>';
                $this->pCounter++;
                break;
            default:
                $this->xhtml .= '<'.$name;
                $this->writeAttrs($attrs);
                $this->xhtml .= ">\n";
                break;
        }
    }
 
    // Closing tag handler
    function closeHandler(&$parser, $name)
    {
        if ($this->inTitle) {
            $this->inTitle = false;
        }
        if ($name == 'body' && $this->pCounter != 0) {
            $this->xhtml .= "</p>\n";
        }
 
        $this->xhtml .= "</".$name.">\n";
    }
 
    // Character data handler
    function dataHandler(&$parser, $data)
    {
        $this->xhtml .= $this->inTitle ? 'This is XHTML 1.0' : $data;
    }
 
    // Escape handler
    function escapeHandler(&$parser, $data)
    {
        if ($data == 'doctype html public "-//W3C//DTD HTML 4.0 Transitional//EN"') {
            $this->xhtml.='<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">';
        }
    }
 
    // Return the XHTML document
    function getXHTML ()
    {
        return $this->xhtml;
    }
}
 
// Get the HTML file
$doc = file_get_contents('example.html');
 
// Instantiate the handler
$handler =& new HTMLtoXHTMLHandler();
 
// Instantiate the parser
$parser =& new XML_HTMLSax3();
 
// Register the handler with the parser
$parser->set_object($handler);
 
// Set the handlers
$parser->set_element_handler('openHandler','closeHandler');
$parser->set_data_handler('dataHandler');
$parser->set_escape_handler('escapeHandler');
 
// Parse the document
$parser->parse($doc);
 
echo $handler->getXHTML();