Simple HTML DOM is an open source HTML DOM parser written for PHP5+ which lets users easily manipulate HTML.
PHP Simple HTML DOM Parser is an open source project created by S.C. Chen, based on the HTML Parser for PHP 4. It's a PHP 5+ HTML DOM parser class which helps with HTML elements manipulation.
The parser is not limited to valid HTML and can also parse HTML code that did not pass W3C validation. Document objects can be found using selectors, similar to what is possible with jquery.
Elements can be targeted with simple css selectors. DOM elements can also be added, deleted or altered. Simple HTML DOM is appropriate for simple tasks but lacks support for many CSS selectors and leaks memory (see manual).
More information on the SourceForge project's page.