Facebook: Post on Page as Page issue (access token / php)

Solution:

// firstly include the fb sdk 

$facebook = new Facebook(array(
                'appId'  => 'your app id',
                'secret' => 'your app secret',`enter code here`
                'cookie' => true,

    ));


$session = $facebook->getUser();
    $loginUrl = $facebook->getLoginUrl(
                    array(
                        'scope' => 'user_status,publish_stream,email,user_location,user_birthday,friends_birthday,manage_pages',
                        'redirect_uri' => 'http://www.example.com/'
                    )
                );

    $logoutUrl = $facebook->getLogoutUrl(
                    array(
                        // any url u want to redirsct onto   
                        'redirect_uri' => 'http://www.example.com/'

                    )
                );

// when redirected from facebook get the code 
    $code = $_GET['code'];

// 

                                        $my_url     = 'http://www.example.com/';

                                        $app_id     = 'your app id ';
                                        $app_secret = 'your app secret ';
                                        // here we have the access token so we will play with it 
                                        if (isset($code)) {
                                                $token_url="https://graph.facebook.com/oauth/access_token?client_id="
                                                  . $app_id . "&redirect_uri=" . urlencode($my_url) 
                                                  . "&client_secret=" . $app_secret 
                                                  . "&code=" . $code ;
                                                $response = file_get_contents($token_url);
                                                $params = null;
                                                parse_str($response, $params);
                                                $user_access_token = $params['access_token'];
                                          }

// here we got the access token of user over here in $user_access_token
// now we will get for our page
//------ get PAGE access token
                                        $attachment_1 = array(
                                            'access_token' => $user_access_token
                                        );
                                        $page_id = 'your page id ';
                                        $result = $facebook->api("/me/accounts", $attachment_1);
                                            foreach($result["data"] as $page) {
                                                if($page["id"] == $page_id) {
                                                    $page_access_token = $page["access_token"];
                                                    break;
                                                }
                                            }

                                        //          write to page wall
                                        try {
                                            $attachment = array(
                                                        'access_token' => $page_access_token,
                                                        'message'=> 'hello world posting like admin!',
                                                        'page_id'=> $page_id
                                                );

                                             $result = $facebook->api('/'.$page_id.'/feed','POST',$attachment);
                                            //$result = $facebook->api('/me/feed','POST', $attachment);
                                            var_dump($result);

                                        } catch(Exception $e) {
                                            echo $e;
                                        }
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Solution:

From your code, it appears you are not getting a PAGE access token which you need, but instead you're using a USER access token, hence why the API doesn't like it. For more information on how to get a PAGE access token from a USER one, please see the Page login section of https://developers.facebook.com/docs/authentication/

Solution:

After many hours of trial and error, here's my solution that works so far.

<?php

require_once 'facebook.php';

//------ vars
$app_id = "123...";
$app_secret = "abc..."; 
$page_id = "999...";
$my_url = "http://exactly the same as defined /";

//------ fb object
$facebook = new Facebook(array(
 'appId' => $app_id,
 'secret' => $app_secret,
 'cookie' => true
));

//------ verification CODE
// this is not pretty -> the code should be received with a another graph query...
// but I couldn't get this to work. Thus I'm using my last known Verification Code
$code = "ABC123...";

//------ get USER access token
if (isset($code)) {
    $token_url="https://graph.facebook.com/oauth/access_token?client_id=" . $app_id 
        . "&client_secret=" . $app_secret 
        . "&code=" . $code 
        . "&redirect_uri=" . $my_url;

    $response = file_get_contents($token_url);
    $params = null;
    parse_str($response, $params);
    $user_access_token = $params['access_token'];

} else {
    echo("No code");
}

//------ get PAGE access token
$attachment_1 = array(
    'access_token' => $user_access_token
);

$result = $facebook->api("/me/accounts", $attachment_1);
    foreach($result["data"] as $page) {
        if($page["id"] == $page_id) {
            $page_access_token = $page["access_token"];
            break;
        }
    }

//------ write to page wall
try {
    $attachment = array(
                'access_token' => $page_access_token,
                'message'=> 'hello world!'
        );

    $result = $facebook->api('/me/feed','POST', $attachment);
    var_dump($result);

} catch(Exception $e) {
    echo $e;
}

?>
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