title: Get value selected from drop down list in where clause using php code
body: <p>My code is like this:</p>
  
  <pre><code>$zone = $_POST['zone'];
  $state = $_POST['state'];
  
  $sql = "Select zone_id from tbl_zone where zone_name = $zone";
  $query = mysql_query($sql);
  </code></pre>
  
  <p>I am selecting zone name which is fetched from database and listed in drop down list.
  Now i want to get id of zone name to store in other table.</p>
  
  <p>In where clause zone_name is blank.
  What changes should be done in above code?</p>
  
  <p>Thanks in advance..</p>