if(correctSess()) {
  if($xObdh) {
    $dbh->prepare("UPDATE items SET users='$xObdh|user=$mainuserid=$qat' WHERE id = '$id'") or die $dbh->errstr;
  } else {
    $dbh->prepare("UPDATE items SET users='|user=$mainuserid=$qat' WHERE id = '$id'") or die $dbh->errstr;
  }
 } else {
  if($xObdh) {
    $dbh->prepare("UPDATE items SET users='$xObdh|guest=$IP=$qat' WHERE id = '$id'") or die $dbh->errstr;
  } else {
    $dbh->prepare("UPDATE items SET users='|guest=$IP=$qat' WHERE id = '$id'") or die $dbh->errstr;
  }
 }

This isnt even adding, and its not even giving an error.