facebook access_token request return NOTHING - php

Question

it's been 5 days that I'm stuck in the implementation of a simple fb login and I'm banging my head like a motherf***r. anyways.
I'm at the point that I'm trying to set the accessToken by hand.
like shown in this post.
https://github.com/facebook/php-sdk/issues/418#issuecomment-2605012
the only problem is that the oauth/access_token call returns nothing
and I'm guessing that it's a pretty messed up behaviour.
this is the snippet I use to make the call
$token_url = "https://graph.facebook.com/oauth/access_token?client_id=".FB_APPID."&redirect_uri=".urlencode($curUrl)."&client_secret=".FB_APPSECRET."&code=".$_GET['code'];
log_to_file("curPageURL: ".$token_url);
$response = file_get_contents($token_url);
log_to_file("resp: ".$respone);
the log_to_file is a custm method that logs the taken message in a file so that I can have the log situation in a tail -f scenario.
what happens here is that the log "resp: ". returns nothing at all.
did anyone face the same problem?
thx in advance. this thing is driving me insane.
and I can officially state that the fb sdk is the most buggy and worse-documented service
I've ever used.

Answer 1

Facebook has the most badly-documented API in the world. I remember the time I used it and couldn't help swearing all the time ! :) Here is a piece of pseudo-code that did work for me. It gains permission from a user to post a link on his wall. I'm just posting it so that maybe you can take some hints and make your code work:
<?php
//A function for cURL operations.
function callFb($url)
{
$ch = curl_init();
curl_setopt_array($ch, array(
CURLOPT_URL => $url,
CURLOPT_RETURNTRANSFER => true
));
$result = curl_exec($ch);
curl_close($ch);
return $result;
}
$url = "https://graph.facebook.com/oauth/access_token?client_id=<your_client_id>&redirect_uri=".urlencode("<the_url_where_the_user_is_redirected_after_granting_permission>")."&client_secret=<your_client_secret>";
/* Get access token. */
$access_token = callFb($url);
/* Parse the result to get access token */
$access_token = substr($access_token, strpos($access_token, "=")+1, strlen($access_token));
/* Save access token, if you want to for future.*/
mysql_query("INSERT INTO fb_auth_tokens (id,auth_token) VALUES('$_GET[id]','$auth_token')");
/* Post to users wall */
$apprequest_url = "https://graph.facebook.com/me/feed";
$mymessage="Hello World !";
$parameters = "?access_token=" . $access_token . "&message=" .
urlencode($mymessage) .
"&link=".urlencode("<link_that_you_want_to_post>").
"&description=<description_of_the_link>".
"&method=post";
$myurl = $apprequest_url . $parameters;
$result = callFb($myurl);
// Thy shall be done. :)