Advanced search for a price range while checking for an empty values using php in DW

Question

I am creating an advanced search with DW php. I would like to submit a search where some entrys can be left black. So checking for empty values (which I have managed, thank you David Powel), however when searching between multiple price ranges does not seem to work.
please see attached forms:
The search page:
<form action="Detailed-Search-Result.php" method="get" target="_self"><table width="90%" border="0" cellspacing="0" cellpadding="2">
  <tr>
    <td colspan="2"><label for="Detailed Search">Advanced Search</label></td>
    </tr><tr>
    <td><label for="Product">Product:</label>
      </td>
    <td><select name="Category" id="Category">
      <option value=></option>
        <option value="Keyboard">Keyboard</option>
        <option value="Piano">Piano</option>
      </select></td>
  </tr>
  <tr>
    <td><label for="Make">Make:</label>
    </td>
    <td><select name="Manufacturer">
      <option value=></option>
      <option value="Boss">Boss</option>
      <option value="Casio">Casio</option>
      <option value="Kawai">Kawai</option>
      <option value="Ketron">Ketron</option>
      <option value="Korg">Korg</option>
      <option value="Roland">Roland</option>
      <option value="Samson">Samson</option>
      <option value="Yamaha">Yamaha</option>
    </select></td>
  </tr>
  <tr>
    <td><label for="Color">Color:</label></td>
    <td><select name="Color">
      <option value=></option>
      <option value="Black">Black</option>
      <option value="Cherry">Cherry</option>
      <option value="Mahogany">Mahogany</option>
      <option value="Polished Eboney">Polished Eboney</option>
      <option value="Rosewood">Rosewood</option>
      <option value="White">White</option>
      <option value="Red">Red</option>
    </select></td>
  </tr>
  <tr>
    <td><label for="Price">Price:</label></td>
    <td><select name="Price">
      <option value=></option>
      <option value="0-500">£0-500</option>
      <option value="500-1000">£500-1000</option>
      <option value="1000-2000">£1000-2000</option>
      <option value="2000">£2000&gt;</option>
    </select></td>
  </tr>
  <tr>
    <td colspan="2">
      <input name="Search2" type="submit" id="Search2"></td>
    </tr>
    </table>
</form>
The results page
$varCategory_rsgetsearch2 = "%";
if (isset($_GET['Category'])) {
  $varCategory_rsgetsearch2 = $_GET['Category'];
$varMake_rsgetsearch2 = "%";
if (isset($_GET['Manufacturer'])) {
  $varMake_rsgetsearch2 = $_GET['Manufacturer'];
$varColor_rsgetsearch2 = "%";
if (isset($_GET['Color'])) {
  $varColor_rsgetsearch2 = $_GET['Color'];
$varPrice_rsgetsearch2 = "%";
if (isset($_GET['Price'])) {
  $varPrice_rsgetsearch2 = $_GET['Price'];
mysql_select_db($database_dBconn, $dBconn);
$query_rsgetsearch2 = 'SELECT * FROM products';
$where = false;
if (isset($_GET['Category']) && !empty($_GET['Category'])) {
$query_rsgetsearch2 .= ' WHERE Category LIKE varCategory '. GetSQLValueString($_GET['Category'], 'text');
  $where = true;
if (isset($_GET['Manufacturer']) && !empty($_GET['Manufacturer'])) {
  if ($where) {
   $query_rsgetsearch2 .= ' AND ';
  } else {
   $query_rsgetsearch2 .= ' WHERE ';
    $where = true;
$query_rsgetsearch2 .= 'Manufacturer LIKE varManufacturer ' . GetSQLValueString($_GET['Manufacturer'], 'text');
if (isset($_GET['Color']) && !empty($_GET['Color'])) {
    if ($where) {
   $query_rsgetsearch2 .= ' AND ';
  } else {
   $query_rsgetsearch2 .= ' WHERE ';
    $where = true;
  $query_rsgetsearch2 .= 'Color LIKE varColor ' . GetSQLValueString($_GET['Color'], 'text');
if (isset($_GET['Price']) && !empty($_GET['Price'])) {
    if ($where) {
   $query_rsgetsearch2 .= ' AND ';
  } else {
   $query_rsgetsearch2 .= ' WHERE ';
    $where = true;
switch( $_GET['Price'] ){
        case '0-500':
        $query_rsgetsearch2 .= '  RRP BETWEEN 0 AND 500 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
        break;
          case '500-1000':
        $query_rsgetsearch2 .= ' RRP BETWEEN 500 AND 1000 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
        break;
                    case '1000-2000':
        $query_rsgetsearch2 .= ' RRP BETWEEN 1000 AND 2000 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
        break;
          case '2000':
       $query_rsgetsearch2 .= ' RRP BETWEEN 2000 AND 10000 ORDER BY price ASC'. GetSQLValueString($_GET['Price'], 'text');
        break;
$query_rsgetsearch2 = sprintf("SELECT * FROM products WHERE Category LIKE %s AND products.Manufacturer LIKE %s AND products.Color LIKE %s", GetSQLValueString("%" . $varCategory_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varMake_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varColor_rsgetsearch2 . "%", "text"));
$query_limit_rsgetsearch2 = sprintf("%s LIMIT %d, %d", $query_rsgetsearch2, $startRow_rsgetsearch2, $maxRows_rsgetsearch2);
$rsgetsearch2 = mysql_query($query_limit_rsgetsearch2, $dBconn) or die(mysql_error());
$row_rsgetsearch2 = mysql_fetch_assoc($rsgetsearch2);
I would be greatfull for any help

Answer 1

I have managed to solve the problem.
In the end I didn't check if the values were empty, as it worked fine without. However the switch of the price didn't work in combination with the rest of the query.
I've solved the problem as follows:
$varCategory_rsgetsearch2 = "%";
if (isset($_GET['Category'])) {
  $varCategory_rsgetsearch2 = $_GET['Category'];
$varMake_rsgetsearch2 = "%";
if (isset($_GET['Manufacturer'])) {
  $varMake_rsgetsearch2 = $_GET['Manufacturer'];
$varColor_rsgetsearch2 = "%";
if (isset($_GET['Color'])) {
  $varColor_rsgetsearch2 = $_GET['Color'];
$varPrice_rsgetsearch2 = "%";
if (isset($_GET['Keysound_price'])) {
  $varPrice_rsgetsearch2 = $_GET['price'];
mysql_select_db($database_dBconn, $dBconn);
$query_rsgetsearch2 = sprintf("SELECT * FROM products WHERE Category LIKE %s AND products.Manufacturer LIKE %s AND products.Color LIKE %s", GetSQLValueString("%" . $varCategory_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varMake_rsgetsearch2 . "%", "text"),GetSQLValueString("%" . $varColor_rsgetsearch2 . "%", "text") );
switch( $_GET['price'] ){
        case '0-500':
        $query_rsgetsearch2 .= ' AND price BETWEEN 0 AND 500 ORDER BY price ASC';
        break;
          case '500-1000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 500 AND 1000 ORDER BYprice ASC';
        break;
                    case '1000-2000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 1000 AND 2000 ORDER BY price ASC';
        break;
          case '2000':
        $query_rsgetsearch2 .= ' AND price BETWEEN 2000 AND 10000 ORDER BY price ASC';
        break;
$query_limit_rsgetsearch2 = sprintf("%s LIMIT %d, %d", $query_rsgetsearch2, $startRow_rsgetsearch2, $maxRows_rsgetsearch2);
$rsgetsearch2 = mysql_query($query_limit_rsgetsearch2, $dBconn) or die(mysql_error());
$row_rsgetsearch2 = mysql_fetch_assoc($rsgetsearch2);
I'm sure that you can keep the checking for values in, however for me the was no need for it anymore.
Thanks for all your help