<?php
//a URL you want to retrieve
$my_url = 'http://www.digg.com';
$html = file_get_contents($my_url);
$dom = new DOMDocument();
$dom->loadHTML($html);
$xpath = new DOMXPath($dom);

//Put your XPath Query here
$my_xpath_query = "/html/body/div[@id='container']/div[@id='contents']/div[@class='list' and @id='wrapper']/div[@class='main' and position()=1]/div[contains(@class, 'news-summary')]/div[@class='news-body']/h3";
$result_rows = $xpath->query($my_xpath_query);

//here we loop through our results (a DOMDocument Object)
foreach ($result_rows as $result_object){
	echo $result_object->childNodes->item(0)->nodeValue;
}
?>

This example uses file_get_contents to retrieve remote HTML. From there, we can parse through it using PHP5's DOMDocument and DOMXpath. XPath Queries are easy to create using the Firefox extension "XPather"

Easy scraping and HTML parsing with PHP5 and XPath

php, html, DOM

PHP