Get Facebook fan page ID

Question

I\'ve got the Facebook user ID of the user who created a given page. Now I need to get the page ID to display like box in my website.

Different users have their own Face

Answer 1

These answers don't seem to work anymore since the graph now requires an access token for most if not all requests.

Here's a working solution that only requires as input the facebook page URL.

What this does is receives the facebook page as HTML and looks through(via regex) for a JSON entity_id that has a numeric value. This value is the page's ID. This solution is surely not guaranteed to work forever since page content may change

/**
 * @param string $facebookUrl
 * @return null|string
 */
function get_facebook_id($facebookUrl)
{
    $facebookId = null;
    $fbResponse = @file_get_contents($facebookUrl);
    if($fbResponse)
    {
        $matches = array();
        if (preg_match('/"entity_id":"([0-9])+"/', $fbResponse, $matches))
        {
            $jsonObj = json_decode("{" . $matches[0] . "}");
            if($jsonObj)
            {
                $facebookId = $jsonObj['entity_id'];
            }
        }
    }
    return $facebookId;
}