how to post on friends' walls using php sdk? - facebook

Question

i am trying to post to my friends' feeds using this code, but it is not working . i am stuck, any help ??
$app_url ="http://localhost.local/PMS/facebook/PostWithPHP.php";
$facebook = new Facebook(array(
'appId' => 'APPID',
'secret' => 'APPSECRET',
'cookie' => true,
));
// Get User ID
$user = $facebook->getUser();
if ($user) {
$user_friends = $facebook->api('/me/friends');
sort($user_friends['data']);
try {
// Proceed knowing you have a logged in user who's authenticated.
$access_token = $facebook->getAccessToken();
$vars = array(
'message' => 'My Message',
'name' => 'title',
'caption' => 'Caption',
'link' => 'Link',
'description' => 'Description',
'picture' => 'image'
);
foreach($user_friends['data'] as $f){
$sendTo = $f['id'];
$sendToName = $f['name'];
$result = $facebook->api("/".$sendTo ."/feed", 'post', $vars);
}
} catch (FacebookApiException $e) {
error_log($e);
$user = null;
}
}
// Login or logout url will be needed depending on current user state.
if ($user) {
$logoutUrl = $facebook->getLogoutUrl();
} else {
$loginUrl = $facebook->getLoginUrl(array('redirect_uri'=> $app_url));
echo "<script type='text/javascript'>";
echo "top.location.href = '{$loginUrl}';";
echo "</script>";
}
and another question is that using this code, but with replacing $facebook->api("/".$sendTo ."/feed", 'post', $vars); by $facebook->api("/me/feed", 'post', $vars); and of course without looping friends, posts on my timeline. how can i make it post on my wall ??

Answer 1

I guess for a post to a timeline you will need an accessToken from the user where to publish the content. In your case you just have the accessToken of the registered user, not of his friends. That is a restriction by FB I think.

Answer 2

1st check you getting the user id(place echo and check) if not try this... I think this will help you brother
$token_url = "https://graph.facebook.com/oauth/access_token?" ."client_id=" . $app_id ."&client_secret=" . $app_secret .
"&grant_type=client_credentials";
$access_token = file_get_contents($token_url);
$signed_request = $_REQUEST["signed_request"];
list($encoded_sig, $payload) = explode('.', $signed_request, 2);
$data = json_decode(base64_decode(strtr($payload, '-_', '+/')), true);
$user_id = $data["user_id"];

Answer 3

There are a few things wrong with your code. First of all, make sure the link and picture parameters for the post are valid URLs. Facebook will give you a error message otherwise ((#100) link URL is not properly formatted). Also, the link must go to the Canvas or Site URL for your application.
That should solve the issues with posting to a friend's wall.
However, may I remind you that your application is in violation of the Facebook Platform Policy. Facebook doesn't allow multiple posts to the stream (whether its yours or a friends) unless there is explicit permission from the user. It also to stop common friends seeing the same message from multiple friends.

Answer 4

You can follow the tutorial here:
https://www.webniraj.com/2012/11/22/facebook-api-posting-a-status-update/
But, instead of making a API call to: /me/feed, you replace me with the friend's User ID, so it looks like /12345/feed
Please note that Facebook has now disabled posting to Friends' walls via the API. Instead, you should either tag the user in an action or use the Requests API.