How to present an Unlike link for a Facebook page - facebook

Question

I have a Facebook app which is interested in whether users like or unlike specific pages. I want to offer a link to unlike a page, as so far as I know there is no way to unlike a page programmatically using the Graph API.
Facebook provide a like button, but (again, so far as I know) no unlike button. How can I present an option to unlike a page without saying "Click here to go to the page, scroll down to the miniscule unlike link and click it"?

Answer 1

You can issue a DELETE request to the page_id
suppose the page id is 1234567890123
place the link as on the a page as:
Unlike
Now collect the GET parameter in the unlike.php file and fire a DELETE request through the graph api:
<?php
$fb = new Facebook(array(
'appId' => FB_APP_ID,
'secret' => FB_APP_SECRET,
'cookie' => true
));
$session = $fb->getSession();
if (empty($session))
{
$loginUrl = $fb->getLoginUrl();
echo "<script>window.top.location='{$loginUrl}';</script>";
exit;
}
$fb_liked_page = $_GET['d']; //COLLECT THE PAGE ID HERE
try
{
$status = $fb->api("/{$fb_liked_page}/likes", 'DELETE');
if ($status)
{
echo "Success, Unliked!";
}
else
{
echo "Could not unlike this page.";
}
}
catch (Exception $e)
{
var_dump($e);
}