$sql = "SELECT * FROM table_t";
$results = mssql_query($sql);
//Generate CSV file - Set as MSSQL_ASSOC as you don't need the numeric values.
while ($l = mssql_fetch_array($results, MSSQL_ASSOC)) {
    foreach($l AS $key => $value){
        //If the character " exists, then escape it, otherwise the csv file will be invalid.
        $pos = strpos($value, '"');
        if ($pos !== false) {
            $value = str_replace('"', '\"', $value);
        }
        $out .= '"'.$value.'",';
    }
    $out .= "\n";
}
mssql_free_result($results);
mssql_close($db);
// Output to browser with the CSV mime type
header("Content-type: text/x-csv");
header("Content-Disposition: attachment; filename=table_t_dump.csv");
echo $out;