PHP: Getting url of facebook likes
<p>I am trying to get information on the likes of the page, since I want to order the posts of my site by likes. I decided to do it by scraping the page, and store the likes of each post id in db, then I can just order using the db. (I can run this 'scraper' every hour or something like that to update the results)</p>

<p>I am doing the following:   </p>

<pre><code> $url = "http://www.mydomain.com";
 $html = file_get_contents($url);
 $dom= new domDocument;
 $dom-&gt;loadHTML($html);
</code></pre>

<p>And I am getting the following errors:</p>

<pre><code>Notice: DOMDocument::loadHTML() [domdocument.loadhtml]: Namespace prefix fb is not defined in Entity, line: 36 in C:\xampp\htdocs\page.php on line 13

Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Tag fb:like invalid in Entity, line: 36 in C:\xampp\htdocs\page.php on line 13
</code></pre>

<p>Somehow the likes are not shown? Also if I do something like this:</p>

<pre><code> $url = "http://www.mydomain.com";
$html = file_get_contents($url);
echo $html;
preg_match_all(
    '/&lt;div id="LikePluginPagelet".*?&gt;.*?&lt;\/div&gt;/s',
    $html,
    $posts,
    PREG_SET_ORDER
);

print_r($posts)
</code></pre>

<p>The first 'echo' actually shows the whole page, but then the print_r just shows <code>Array ( )</code> </p>

<p>Is it possible that some things cannot be grabbed via php? Here is an example page: <a href="http://developers.facebook.com/docs/reference/plugins/like/" rel="nofollow">http://developers.facebook.com/docs/reference/plugins/like/</a></p>

<p>You can see that where the like is and the number of likes, the div has id 'LikePluginPagelet', but PHP does not obtain the stuff inside it.</p>

<p>Update:</p>

<p>Can you make code that will get the 500K number of likes from here by scraping the page? <a href="http://developers.facebook.com/docs/reference/plugins/like/" rel="nofollow">http://developers.facebook.com/docs/reference/plugins/like/</a> Or any other page that contains a number of likes, if I can get that I can use it in my code as well.</p>

<p>Thanks!</p>
