Вывод результатов поискового запроса

 <?php
 if ($_REQUEST["string"]<>'') {
 $search_string = " AND (number LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%' OR name LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%')"; 
 }
 if ($_REQUEST["city"]<>'') {
 $search_city = " AND city='".mysql_real_escape_string($_REQUEST["city"])."'"; 
 }
 $sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE id>0".$search_string.$search_city;
 $sql_result = mysql_query ($sql, $connection ) or die ('request "Could not execute SQL query" '.$sql);
 if (mysql_num_rows($sql_result)>0) {
 while ($row = mysql_fetch_assoc($sql_result)) {
 ?>
 <tr>
 <td><?php echo $row["id"]; ?></td>
 <td><?php echo $row["number"]; ?></td>
 <td><?php echo $row["name"]; ?></td>
 <td><?php echo $row["qty"]; ?></td>
 <td><?php echo $row["price"]; ?></td>
 <td><?php echo $row["city"]; ?></td>
 </tr>
 <?php
 }
 } else {
 ?>
 <tr><td colspan="5">No results found.</td>
 <?php 
 }
 ?>
 
 При попытке преобразовать код под мои нужды пришёл к следующему коду.
 
 <?php
 if ($_REQUEST["string"]<>'') {
 $search_string = " AND (number LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%' OR name LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%')";
 $search_city = " AND city='".mysql_real_escape_string($_REQUEST["city"])."'";
 $sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE id>0".$search_string.$search_city; 
 }
 else {
 $search_string = " AND (number LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%' OR name LIKE '%".mysql_real_escape_string($_REQUEST["string"])."%')";
 $sql = "SELECT * FROM ".$SETTINGS["data_table"]." WHERE id>0".$search_string; 
 } 
 $sql_result = mysql_query ($sql, $connection ) or die ('request "Could not execute SQL query" '.$sql);
 if (mysql_num_rows($sql_result)>0) {
 while ($row = mysql_fetch_assoc($sql_result)) {
 ?>
 <tr>
 <td><?php echo $row["id"]; ?></td>
 <td><?php echo $row["number"]; ?></td>
 <td><?php echo $row["name"]; ?></td>
 <td><?php echo $row["qty"]; ?></td>
 <td><?php echo $row["price"]; ?></td>
 <td><?php echo $row["city"]; ?></td>
 </tr>
 <?php
 }
 } else {
 ?>
 <tr><td colspan="5">No results found.</td>
 <?php