Facebook PHP SDK Capture Like Event - facebook

Question

I need to record to the database if a user likes an iframe page tab using the official Facebook 'like' button at the top. I did a search here at stackoverflow and found a javascript snippet ...
FB.Event.subscribe('edge.create',
function(response) {
alert('You liked the URL: ' + response);
}
);
But it doesn't fire for the official button (only like buttons added to the page)? I declare it after FB.init and before FB.Canvas resize inside the asynchronous call. Is there a way in PHP to capture this - possible on refresh? Either JS or PHP is okay (since JS can simply ajax a php file). The signed request contains whether they like the page or not but I need to capture it as it happens (or just happened).
Any help greatly appreciated :-)

Answer 1

Try :
window.fbAsyncInit = function () {
FB.Event.subscribe('edge.create', function (targetUrl) {
_gaq.push(['_trackSocial', 'facebook', 'like', targetUrl]);
});
};
I think you just need to setup the subscript inside the fbAsyncInit.

Answer 2

Did it a purely PHP way in the end.
1: Get the signed request from facebook and extract the liked stats
2: Create a variable $liked and set to "yes" or "no" based on signed request value
3: Manipulate a session - use a session because the page gets refreshed when you "like" but the session remains (but the request value will have changed)
if(isset($_SESSION['likestatus'])){
if($_SESSION['likestatus'] == "no" && $liked == "yes"){
// do mysql updatestuff cause has liked page since session started
$_SESSION['likestatus'] = $liked;
}
else{
$_SESSION['likestatus'] = $liked;
}
}
else {
$_SESSION['likestatus'] = $liked;
}