PHP craigslist start (in progress)

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="utf-8">
        <title>New Craigslist listings</title>
        <link href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.1.1/css/bootstrap.min.css" rel="stylesheet">
        <link href='http://fonts.googleapis.com/css?family=Milonga' rel='stylesheet' type='text/css'>
    </head>
    <body>
        <p>
            <?php
            $cities = array("washingtondc", "miami", "sfbay", "newyork", "losangeles", "sandiego"); #Craigslist subdomains
            $keywords = array("web*", "wordpress", "site"); # What you want to search for...
            $category = "cpg"; # Craigslist category key

            foreach ($cities as $city) {
                $link = "http://" . $city . ".craigslist.org" . "/" . $category;
                $dom = new DomDocument($link);
                @$dom->loadHTML($html);
                $urls = $dom->getElementsByTagName('a');
                foreach ($urls as $url) {
                    $attributes = $url->attributes;
                    echo "<br>$url->nodeValue is $attributes->href";
                    ob_flush();
                    flush();
                    break;
                }
            }
            ob_end_flush();
            ?>
        </p>
    </body>
</html>