How to log out users using Facebook Connect in PHP and Zend?

You have to call the javascript client logout first, then send them to your php logout script. So, call .js:

FB.Connect.logoutAndRedirect("/path/to/zend/logout/controller");

You'll see a modal popup that says "you are logging out of this site and facebook* You'll be redirected to wherever your logout script is:

try{
    $facebook->expire_session();}catch(FacebookRestClientException $e){//you'll want to catch this//it fails all the time}

I usually also call this function in the PHP logout script, just to be safe:

/**
 * Remove the local Facebook cookies that get set manually
 * 
 * @return void
 */protectedfunction _killFacebookCookies(){// get your api key
    $apiKey = $this->getConfig()->getApiKey();// get name of the cookie
    $cookie = $this->getConfig()->getCookieName();

    $cookies = array('user','session_key','expires','ss');foreach($cookies as $name){
        setcookie($apiKey .'_'. $name,false, time()-3600);
        unset($_COOKIE[$apiKey .'_'. $name]);}

    setcookie($apiKey,false, time()-3600);
    unset($_COOKIE[$apiKey]);}