Question

I’ve a facebook app which posts in the user wall. In the post there is a link (to my app) and in the liked page there is a like button.

Now I’m making a script that will run once per hour (set from the crontab). In that script I need to get two different likes count:

1. Likes in the message posted in the wall.
2. Likes done in my app (with the button).

For the first one I’ve made this code:

$result = $facebook->api(array(
              'method' => 'fql.query',
              'query' => 'SELECT user_id FROM like WHERE post_id="'.$idPost.'"'
          ));
$likesWall = count($result);

This code was working, but suddenly it is not. It throws this exception:

Fatal error: Uncaught Exception: 190:
Error validating access token: The
session is invalid because the user
logged out. thrown in C:\(…)\facebook\base_facebook.php
on line 656

For the second likes count

I really don’t know how I have to do it. I’ve tried:

$result = $facebook->api(array(
              'method' => 'links.getStats',
              'urls' => $canvasPage."somePage.php?id=".$id
          ));

But this throws:

Fatal error: Uncaught CurlException:
60: SSL certificate problem, verify
that the CA cert is OK. Details:
error:14090086:SSL
routines:SSL3_GET_SERVER_CERTIFICATE:certificate
verify failed thrown in
C:\(…)\facebook\base_facebook.php
on line 759

And then this was given to me: http://graph.facebook.com/?ids=http://apps.facebook.com/appName/somePage.php?id=68&metadata=1 where the bold part is the url in the like button I created. When I put it in the browser it returns me a JSON with some information (including the likes count) but I don’t know how to use it in my script.

More information:

Here is the code to define facebook object:

include_once 'facebook/facebook.php';
$facebook = new Facebook(array(
    'appId'  => $appId,
    'secret' => $secret
  ));

I’m using the latest version the SDK (v3).

Answer 1

I found it!

I made it this way:

function get_content($url){
    $options = array(
        CURLOPT_RETURNTRANSFER => true,     // return web page
        CURLOPT_HEADER         => false,    // don't return headers
        CURLOPT_FOLLOWLOCATION => true,     // follow redirects
        CURLOPT_ENCODING       => "",       // handle all encodings
        CURLOPT_USERAGENT      => "spider", // who am i
        CURLOPT_AUTOREFERER    => true,     // set referer on redirect
        CURLOPT_CONNECTTIMEOUT => 120,      // timeout on connect
        CURLOPT_TIMEOUT        => 120,      // timeout on response
        CURLOPT_MAXREDIRS      => 10,       // stop after 10 redirects
        CURLOPT_SSL_VERIFYPEER => false,
        CURLOPT_SSL_VERIFYHOST => 2,
    );

    $ch      = curl_init( $url );
    curl_setopt_array( $ch, $options );
    $content = curl_exec( $ch );
    $err     = curl_errno( $ch );
    $errmsg  = curl_error( $ch );
    $header  = curl_getinfo( $ch );
    curl_close( $ch );

    $header['errno']   = $err;
    $header['errmsg']  = $errmsg;
    $header['content'] = $content;
    //return $header;
    return $content;
}

$facebook = new Facebook(array(
    'appId'  => $appId,
    'secret' => $secret
));

$accessToken = get_content("https://graph.facebook.com/oauth/access_token?type=client_cred&client_id=".$appId."&client_secret=".$secret);
$accessToken = substr($accessToken, strpos($accessToken, "=") + 1);

$fqlResult = get_content("https://api.facebook.com/method/fql.query?query=SELECT+user_id+FROM+like+WHERE+post_id%3D\"".$idPost."\"&format=json&access_token=".$accessToken);
$fqlResult = json_decode($fqlResult);
$countLikesWall = count($fqlResult);

$fqlResult = get_content("https://api.facebook.com/method/fql.query?query=SELECT+like_count+FROM+link_stat+WHERE+url%3D\"http%3A%2F%2Fapps.facebook.com%2F**MyAppsName**%2F**somePage**.php%3Fid%3D".$id."\"&format=json&access_token=".$accessToken);
$fqlResult = json_decode($fqlResult);

$countLikesUrl = $fqlResult[0]->like_count;