Example of how to scrape multiple pages using Zend\Dom from Zend Framework 2.

scraping.php

<?php

use \Zend\Dom\Query;
use \Zend\Debug\Debug;

/**
 * Fetch the page source and cache it, ensuring it's saved as UTF-8
 *
 * @param  string $url
 * @return string
 */
function fetch($url)
{
    $content = '';
    $md5 = md5($url);
    $path = __DIR__.'/cache/' . $md5;
    if (!file_exists($path)) {
        $content = file_get_contents($url);
        $content = mb_convert_encoding($content, 'UTF-8', mb_detect_encoding($content, 'UTF-8, ISO-8859-1', true));
        file_put_contents($path, $content);
    } else {
        $content = file_get_contents($path);
    }
    return $content;
}

$tags = [];
$site = fetch('http://sussex.academia.edu/');
$sdom = new Query($site);

foreach ($sdom->execute('div#department_list ul li a') as $href) {
    $url = $href->getAttribute('href');
    $ddom = new Query(fetch($url));
    $page = $ddom->execute('h1')->current()->nodeValue;
    foreach ($ddom->execute('div#user_list fieldset') as $fieldset) {
        $xml = simplexml_import_dom($fieldset);
        if (strtolower((string)$xml->legend) == 'faculty') {
            $subd = new Query($xml->asXml());
            foreach ($subd->execute('div.user_strip') as $userNode) {
                $userXml = simplexml_import_dom($userNode);
                $linkd = new Query($userXml->asXml());
                $links = [];
                foreach ($linkd->execute('div.user_research_interests a.research_interest_link') as $link) {
                    $links[] = $link->nodeValue;
                }
                if (count($links)) {
                    $tags[$page][(string)$userXml->h3->a] = $links;
                }
            }
        }
    }
}

Debug::dump($tags);