就像在帖子中发表评论一样

I have a problem when I try using facebook php api to like a comment

To "Like" this comment I used

try {
    $temp = $facebook->api('/3722461/likes?access_token="' . $facebook->getAccessToken() . '"', 'POST');
    echo "ok";
} catch (Exception $e) {
    var_dump($e);
}

but this throws an exception

["error"]=>
    array(3) {
      ["message"]=>
      string(36) "(#100) The parameter url is required"
      ["type"]=>
      string(14) "OAuthException"
      ["code"]=>
      int(100)
    }

How do I fix this?

Some posts (such as Events) are not eligiable for having Likes (i.e. you can attend to it but cannot likes it) - in these cases you'll get this error