Posting to PAGE as PAGE
<?
require_once 'facebook.php';
$app_id = "APP_ID";
$app_secret = "APP_SECRET";

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

if(is_null($facebook->getUser()))
{
 header("Location:{$facebook->getLoginUrl(array('req_perms' => 'user_status,publish_stream,user_photos,manage_pages,offline_access'))}");
 exit;
}
?>
	
<?
require_once 'facebook.php';

$app_id = "APP_ID";
$app_secret = "APP_SECRET";
$page_id = "PAGE_ID";
$page_access_token = "PAGE_TOKEN";
$facebook = new Facebook(array(
 'appId' => $app_id,
 'secret' => $app_secret,
 'cookie' => true
));

if( !empty($page_access_token) ) {
    $args = array(
        'access_token'  => $page_access_token,
        'message'       => "Test post"
    );
    $post_id = $facebook->api("/$page_id/feed","post",$args);
} else {
}
header("Location: http://example.com/")

?>