Question

I have an PHP Switch case. How do I swt the value of “n” using the onclick of a button?

    switch (n)
     {
     case 1:
       $result = mysql_query("select * from tblRestaurants order by RestName ASC");
       break;
     case 2:
       $result = mysql_query("select * from tblCuisines order by RestName ASC");
       break;
     case 3:
       $result = mysql_query("select * from tblLocations order by RestName ASC");
       break;
      case 4:
       $result = mysql_query("select * from tblLocations order by RestName ASC");
       break;
     case 5:
       $result = mysql_query("select * from tblLocations order by RestName ASC");
       break;
     } 

onclick = (switch)n=1

Just guessing

Answer 1

The only way you can set a PHP variable after the page has loaded with a request for a JSON data return… All PHP code is executed before all of the HTML so if you submit a button you can call a java-script function but you can only use java-script functions from that onClick call.
If you insist on not having your page refresh you would have to use a lot of AJAX and get a JSON data return document. But if you are fine with a page redirect you could just have a form submit to the same page and then at the top of the page check if you posted and if so then execute your queries.
Top of Page:

<?php
if(isset($_POST['form_submit'])){
//do your queries
}
?>

In your form:

<form action='' method='POST'>
<input type='submit' name='form_submit' value='Go'>
</form>