Is it possible to post on a Facebook wall as application and not as user? As far as I understand an application is not a valid user for Facebook, but there are numerous comments about posting as Page and not as User or Application.
How can I do it using PHP Facebook API?
You need the publish_stream,manage_pages
permissions. The code is something like:
<?php
// This code is just a snippet of the example.php script
// from the PHP-SDK <https://github.com/facebook/facebook-php-sdk/blob/master/examples/example.php>
require '../src/facebook.php';
// Create our Application instance (replace this with your appId and secret).
$facebook = new Facebook(array(
'appId' => 'app_id',
'secret' => 'app_secret',
));
// Get User ID
$user = $facebook->getUser();
if ($user) {
try {
$page_id = 'page_id';
$page_info = $facebook->api("/$page_id?fields=access_token");
if( !empty($page_info['access_token']) ) {
$args = array(
'access_token' => $page_info['access_token'],
'message' => "I'm a Page!"
);
$post_id = $facebook->api("/$page_id/feed","post",$args);
} else {
$permissions = $facebook->api("/me/permissions");
if( !array_key_exists('publish_stream', $permissions['data'][0]) ||
!array_key_exists('manage_pages', $permissions['data'][0])) {
// We don't have one of the permissions
// Alert the admin or ask for the permission!
header( "Location: " . $facebook->getLoginUrl(array("scope" => "publish_stream, manage_pages")) );
}
}
} 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('scope'=>'manage_pages,publish_stream'));
}
// ... rest of your code
?>
I've written and in-depth tutorial about this: How To: Post On Facebook Page As Page Not As Admin User Using PHP-SDK
You must first have a user authorize via facebook connect, and request the manage_pages permission as a part of this request. You can use this permission to obtain a token and secret for the page in question. You then use those to authorize requests as opposed to the token/secret you received for the user.
Check out the "Page Login" section of this page for some additional info: http://developers.facebook.com/docs/authentication/
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