top.location.href='" . $dialog_url . "'");
}
$token_url = "https://graph.facebook.com/oauth/access_token?client_id="
. $app_id . "&redirect_uri=" . urlencode($my_url)
. "&client_secret=" . $app_secret
. "&code=" . $code;
$response = file_get_contents($token_url);
$params = null;
parse_str($response, $params);
$access_token = $params['access_token'];
//get the user's photos and photo_id for the first pictre
$post_url = "https://graph.facebook.com/me/photos?"
. "access_token=". $access_token;
$response = file_get_contents($post_url);
$decoded_response = json_decode($response);
$photo_id = $decoded_response->data[0]->id;
//Tag friend_to_tag_id at position (x_coordinate, y_coordinate)
$post_url = "https://graph.facebook.com/"
.$photo_id . "/tags/" . $friend_to_tag_id
. "?access_token=". $access_token
. "&x=" . $x_coordinate . "&y=" . $y_coordinate . "&method=POST";
$response = file_get_contents($post_url);
if ($response)
{
//Print the tag we just added
show_tag_info($photo_id, $friend_to_tag_id, $access_token);
//Update the x and y coordiates of the user_id
$post_url = "https://graph.facebook.com/"
.$photo_id . "/tags/" . $friend_to_tag_id
. "?access_token=". $access_token
. "&x=" . $x_new_coordinate . "&y=" . $y_new_coordinate
. "&method=POST";
$response = file_get_contents($post_url);
//Print the tag we just updated
show_tag_info($photo_id,$friend_to_tag_id, $access_token);
}
else echo("errors");
//Function to print the tag information for friend_to_tag_id
function show_tag_info($photo_id, $friend_to_tag_id, $access_token)
{
//get the tags on the picture
$post_url = "https://graph.facebook.com/"
. $photo_id ."/tags?access_token=". $access_token;
$response = file_get_contents($post_url);
$decoded_response = json_decode($response);
//get the tag for friend_to_tag_id and display its coordinates
foreach ($decoded_response->data as $tag)
{
$user_id = $tag->id;
if ($user_id==$friend_to_tag_id) break;
}
$x = $tag->x; $y = $tag->y;
$text= "user id= " . $user_id . " x = ". $x . " y = ". $y;
echo ($text . “);
}
?>