why am i removing html mysql trade csv?

i know doubt asked before, nonetheless i ran problem.

oddly enough, i govern function, includes html page couple name govern function.

function exportcsv($table) {
    $result = mysql_query("show columns ".$table."");
    $i = 0;
    (mysql_num_rows($result) > 0) {
        while ($row = mysql_fetch_assoc($result)) {
            $csv_output .= $row['field']."; ";
            $i++;
        }
    }
    $csv_output .= "\n";

    $values = mysql_query("select * ".$table."");
    while ($rowr = mysql_fetch_row($values)) {
        ($j=0;$j<$i;$j++) {
            $csv_output .= $rowr[$j]."; ";
        }
        $csv_output .= "\n";
    }

    $filename = $file."_".date("y-m-d_h-i",time());
    header("content-type: application/vnd.ms-excel");
    header("content-disposition: csv" . date("y-m-d") . ".csv");
    header( "content-disposition: filename=".$filename.".csv");
    imitation $csv_output;
    exit;
}

does anyone know since consolidate html csv file?