pdo select neden çalışmaz

 
  	$rehist = $sbt->prepare('SELECT * FROM rehber WHERE id= :id LIMIT 1'); 
  	 
  	$rehist->bindValue(':id', $_GET[rid], PDO::PARAM_INT);  
  	$rehist->execute();	 
  	$rhbr = $rehist->fetch(PDO::FETCH_ASSOC); 
  

$rid = $_GET['rid']; 
  $rehist = $sbt->prepare("SELECT * FROM rehber WHERE id= :id LIMIT 1"); 
  $rehist->bindParam(":id", $rid, PDO::PARAM_INT); 
  $rehist->execute(); 
  $rhbr = $rehist->fetch(PDO::FETCH_OBJECT); 
   
  echo $rehist->cekilecek_deger;