Codeigniter and facebook php sdk autopost to company wall

You will need to get the Appid, App secret and an access token. You can extend the access token so that it doesn't expire.

$graphUrl = 'https://graph.facebook.com/oauth/access_token?client_id='.APPID .'&client_secret='.APPSECRET.'&grant_type=fb_exchange_token&fb_exchange_token='.ACCESS_TOKEN;

$accessToken = @file_get_contents($graphUrl);
parse_str($accessToken); //get the access_token param in the string and would be named $access_token
if(!$access_token) $access_token = $accessToken; //if cannot be extended then just return the access token with 2 hours expiry

In order to post as your company page, you will need their page id.

Here is part of my script that I used to get all this working. Its not codeigniter, but you will be able to see how it works.

$config = array(
        'appId' => APPID,
        'secret' => APPSECRET,
);


        $facebook = new Facebook($config);
        $facebook->setAccessToken(ACCESS_TOKEN);

        // Get User ID
        $user = $facebook->getUser();

if ($user) {

        try {
                $page_id = '************'; // 
                $page_info = $facebook->api("/$page_id?fields=access_token");
                if(!empty($page_info['access_token']) ) {
                        // do your code stuff

                 }

         } catch etc etc

Hope this is helpful to you