Tutorial: [APPS] Publicar diariamente en el muro del usuario

<?php
    //Config de tu apps
    $app_id = "TU_APP_ID";
    $app_secret = "APP_SECRET";
    $miappurl = "http://apps.facebook.com/miapps/";

    //Verificamos
    $code = $_REQUEST["code"];
    if(!$code){
        //Armamos la url con los permisos a usar!
        $dialog_url= "http://www.facebook.com/dialog/oauth?client_id=".$app_id."&redirect_uri=".urlencode($miappurl)."&scope=publish_stream,offline_access";
        echo("<script>top.location.href='".$dialog_url."'</script>");
        die();
    }else{
        //Obtenemos el access_token (nos permitira publicar en el muro)
        $token_url="https://graph.facebook.com/oauth/access_token?client_id=".$app_id."&client_secret=".$app_secret."&redirect_uri=".urlencode($miappurl)."&code=".$code;
        $response = @file_get_contents($token_url);
        $params = null;
        parse_str($response, $params);
        $access_token = $params['access_token'];

        //Obtener el uid del usuario
        $uid_url = "https://graph.facebook.com/me?fields=id,first_name&access_token=".$access_token;
        $dto = @file_get_contents($uid_url);
        $dto = json_decode($dto,true);
        $user_id = $dto['id'];
        $nombre = $dto['first_name'];

        //Nos comentamos a nuestra BD
        $dbhost = "localhost";
        $dbuser = "usuario";
        $dbpass = "password";
        $dbname = "base_de_datos";

        $dbh = mysql_connect($dbhost,$dbuser, $dbpass);
        mysql_select_db("$dbname") or die ("Error!");

        //Verificamos si el usuario ya existe!
        $SQL = @mysql_query("SELECT uid FROM usuarios_face WHERE uid='".$user_id."'");
        $ROW = @mysql_fetch_array($SQL);
        if($ROW['uid']==""){
            @mysql_query("INSERT INTO usuarios_face VALUES('".$user_id."','".$access_token."','".$nombre."','')");
        }

        //Mostramos el horoscopo
        $SIG = array('acuario','aries','capricornio','cancer','escorpio','geminis','leo','libra','piscis','sagitario','tauro','virgo');

        echo '<center>Seleccione su signo del zodiaco<br/><form action="'.$miappurl.'?code='.$code.'" target="_top" method="GET"><select name="signo">';
        foreach($SIG as $S){
            echo '<option value="'.$S.'">'.ucwords($S).'</option>';
        }
        echo '</select><br/><input type="hidden" name="code" value="'.$code.'"><input type="submit" value="Ver mi horoscopo"></form><br/>';

        if($_REQUEST['signo']!=""){
            //Guardamos el signo
            mysql_query("UPDATE usuarios_face SET signo='".$_REQUEST['signo']."' WHERE uid='".$user_id."'");
            //Mostramos el signo
            include('horos_'.$_REQUEST['signo'].'.txt');
        }
    }
?>

<?php
    @set_time_limit(0);

    $app_id = "TU_APP_ID";
    $app_secret = "APP_SECRET";
    $miappurl = "http://apps.facebook.com/miapps/";
    $nombreapp = "Horoscopo del dia";

    //Nos comentamos a nuestra BD
    $dbhost = "localhost";
    $dbuser = "usuario";
    $dbpass = "password";
    $dbname = "base_de_datos";

    $dbh = mysql_connect($dbhost,$dbuser, $dbpass);
    mysql_select_db("$dbname") or die ("Error!");

    $SIG = array('acuario','aries','capricornio','cancer','escorpio','geminis','leo','libra','piscis','sagitario','tauro','virgo');
    //cargamos los signos en un array, para no tener que leer el file por cada usuario, evitano cargar el server
    foreach($SIG as $S){
        $H[$S] = file_get_contents('horos_'.$S.'.txt');
    }

    //Cargamos todos los usuarios
    $SQL = @mysql_query("SELECT * FROM usuarios_face WHERE 1");
    while($ROW = @mysql_fetch_array($SQL)){
        $posteo_url = "https://graph.facebook.com/" 
            . $ROW['uid'] . "/feed?"
            . "&message="
            . "&picture=" . urlencode('http://www.miweb.com/img/'.$ROW['signo'].'.jpg')
            . "&link=" . urlencode($miappurl)
            . "&name=" . urlencode($nombreapp)
            . "&caption=" . urlencode($H[$ROW['signo']])
            . "&method=POST"
            . "&access_token=" .$ROW['access_token'];

        @file_get_contents($posteo_url);
    }

    die('Terminado');
?>

CREATE TABLE `usuarios_face` (
`uid` DOUBLE NOT NULL ,
`access_token` TEXT NOT NULL ,
`nombre` VARCHAR( 25 ) NOT NULL ,
`signo` VARCHAR( 20 ) NOT NULL ,
INDEX ( `uid` )
) ENGINE = MYISAM ;