With this simple script you can grab content of your desired web site by DOM class of it. Have Fun!

PHP - PhpWebCrawler.php

<?php
  // Set variables
	$url = 'http://path/to/your/target';
	$className = 'foo';
	
	// Initialize CURL
	$curl = curl_init(); 
	curl_setopt($curl, CURLOPT_URL, $url);  
	curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);  
	curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 10);  
	$html = curl_exec($curl);  
	curl_close($curl);  

	// Create DOM and XPATH
	$dom = new DOMDocument();
	@$dom->loadHTML($html);
	$xpath = new DomXpath($dom);
	
	// Query through XPATH
	$allXpathElements = $xpath->query("//*[@class='$className']");
	$allXpathElementsLength = $allXpathElements->length;
	for ($i = 1; $i <  $allXpathElementsLength; $i++)
	{
		$allXpathElementsArray[] = $allXpathElements->item($i)->textContent;
	}
	
	// Fire!
	var_dump($allXpathElementsArray);
?>