Why dosent this work ?

Hi!

Have this function in my php file:

function brukerident($bruker_ID)
{
        $uuk = mysql_real_escape_string($_COOKIE["uuk"]);
        $sql = "SELECT Bruker_id FROM brukere WHERE uuk = '$uuk' LIMIT 1";
        $res = mysql_query($sql);
        
        // IF THE QUERY SUCCEEDED
        if ($res)
        {
            // THERE SHOULD BE ONE ROW
            $num = mysql_num_rows($res);
            if ($num)
            {
                // RETRIEVE THE ROW FROM THE QUERY RESULTS SET
                $row = mysql_fetch_assoc($res);

                // STORE THE USER-ID IN THE SESSION ARRAY
                return $row["Bruker_id"];
          
            }
        }
}

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This function is called from a another php file:

 $brukerID = brukerident('xxx');

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And i have tested that the returnd value is correct.

Value from database is a varchar..

But get an error message from this line:

$result3 = mysql_query("SELECT Navn FROM {$table1} WHERE Bruker_id={$brukerID}") or die(mysql_error());

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Error message is:
Unknown column 'K007' in 'where clause'

What is wrong ?