phpQuery - pq();
phpQuery is a server-side, chainable, CSS3 selector driven Document Object Model (DOM) API based on jQuery JavaScript Library. 
Library is written in PHP5 and provides Command Line Interface (CLI). 
Manual
 * Basics 
 * Ported jQuery sections 
   * Selectors 
   * Attributes 
   * Traversing 
   * Manipulation 
   * Ajax 
   * Events 
   * Utilities 
   * Plugin ports 
 * PHP Support 
 * Command Line Interface 
 * Multi document support 
 * Plugins 
   * WebBrowser 
   * Scripts 
 * jQueryServer 
 * Debugging 
 * Bootstrap file 

Download
 * Release packages (rss) 
   * ZIP format 
   * RPM format 
 * Release notes 
 * Bugs: active / fixed 
 * Dependencies 
 * SVN checkout 

Documentation
 * Wiki 
 * Manual 
 * API reference 
 * jQuery documentation wiki 
   * CHM version 
   * CheatSheet 

Publications
 * Official blog with latest release notes 
 * Author's blog with examples and new feature sneak peaks 
 * Roadmap: Planned / Done 

Feedback
 * Issue/Bug Tracker (new issue) 
 * Google Group 
 * IRC #phpquery at freenode.net 
 * ohloh.net has phpQuery project 

Examples
CLI
Fetch number of downloads of all release packages 
phpquery 'http://code.google.com/p/phpquery/downloads/list?can=1' \
  --find '.vt.col_4 a' --contents \
  --getString null array_sum
PHP
Examples from demo.php 
require('phpQuery/phpQuery.php');
INITIALIZE IT
// $doc = phpQuery::newDocumentHTML($markup);
// $doc = phpQuery::newDocumentXML();
// $doc = phpQuery::newDocumentFileXHTML('test.html');
// $doc = phpQuery::newDocumentFilePHP('test.php');
// $doc = phpQuery::newDocument('test.xml', 'application/rss+xml');
// this one defaults to text/html in utf8
$doc = phpQuery::newDocument('<div/>');
FILL IT
// array syntax works like ->find() here
$doc['div']->append('<ul></ul>');
// array set changes inner html
$doc['div ul'] = '<li>1</li><li>2</li><li>3</li>';
MANIPULATE IT
// almost everything can be a chain
$li = null;
$doc['ul > li']
	->addClass('my-new-class')
	->filter(':last')
		->addClass('last-li')
// save it anywhere in the chain
		->toReference($li);
SELECT DOCUMENT
// pq(); is using selected document as default
phpQuery::selectDocument($doc);
// documents are selected when created or by above method
// query all unordered lists in last selected document
pq('ul')->insertAfter('div');
ITERATE IT
// all LIs from last selected DOM
foreach(pq('li') as $li) {
	// iteration returns PLAIN dom nodes, NOT phpQuery objects
	$tagName = $li->tagName;
	$childNodes = $li->childNodes;
	// so you NEED to wrap it within phpQuery, using pq();
	pq($li)->addClass('my-second-new-class');
}
PRINT OUTPUT
// 1st way
print phpQuery::getDocument($doc->getDocumentID());
// 2nd way
print phpQuery::getDocument(pq('div')->getDocumentID());
// 3rd way
print pq('div')->getDocument();
// 4th way
print $doc->htmlOuter();
// 5th way
print $doc;
// another...
print $doc['ul'];