[PHP] Function misfunction - 2

[Martin S]

NOW what am I doing wrong??

function setCurrentDevGroup($devID)
     {
        $query = "SELECT dev_group FROM tracking WHERE (computer = $devID)";
                $sth = $adb->prepare($query);
                if($sth)
                {
                        $res = $sth->execute();
                        $resulttable = $sth->fetchrow_hash();
                        $lookuptable = $resulttable["dev_group"];
                }
                echo $lookuptable; // gives e.g. printers
                return $lookuptable; // will not return the value to ....
      }

.
.
.
setCurrentDevGroup($this->ComputerID); // calling function
$query = "SELECT name FROM $lookuptable WHERE (ID = $this->ComputerID)";
//debug line
echo $lookuptable;   // gives an empty string.                                       

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