First, ]] Text_Wiki into your [[http://pear.php.net/|PEAR]] library, then try the quick example below.
=====  Quick Example =====
Here's a quick example on how to use Text_Wiki to parse wiki text and render it into XHTML:<code php>


// load the class file
require_once 'Text/Wiki.php';

// instantiate a Text_Wiki object with the default rule set
$wiki =& new Text_Wiki();

// when rendering XHTML, make sure wiki links point to a
// specific base URL
$wiki->setRenderConf('xhtml', 'wikilink', 'view_url',
 'http://example.com/view.php?page=');

// set an array of pages that exist in the wiki
// and tell the XHTML renderer about them
$pages = array('HomePage', 'AnotherPage', 'SomeOtherPage');
$wiki->setRenderConf('xhtml', 'wikilink', 'pages', $pages);

// load some wiki text from a file or database
$text = "+ Header Level 1

Here's a paragraph and a link to AnotherPage.

* list item 1
* list item 2

Link to a NewPage like this.";

// transform the wiki text into XHTML
$xhtml = $wiki->transform($text, 'Xhtml');

// display the transformed text
echo $xhtml;

</code>