a.php

<form name="form" action="b.php">
<p>
 <label>
 <input type="radio" name="RadioGroup1" value="Food">
 Food</label>
 <select name="food99" size="1">
  <option value="burger">Burger</option>
  <option value="pizza">Pizza</option>
 </select>
 <br>
 <label>
 <input type="radio" name="RadioGroup1" value="Sports">
 Sports</label>
 <select name="sports99" size="1">
  <option value="basketball">Basketball</option>
  <option value="swimming">Swimming</option>
 </select>
</p>
<p>
  <input type="submit" name="Submit" value="Submit">
  <br>
</p>
</form>

The form is saved in a.php . i thought <input type="radio" name="RadioGroup1" value="<select name="food" .. . . </select>"> will work, but it caused many errors. i want the second select box(sports) is disabled when the user selects radiogroup1="Food".

In b.php,

if the user select <input type="radio" name="RadioGroup1" value="Food">, the value of "food99" will send to c.php.
Otherwise, the value of "sports99" will send to d.php

i found an ASP example from wrox's book-Beginning ASP 3.0 page 280.

PageChoice.html
<form name="form" action="choosepage.asp" method="POST">

  <input type="radio" name="RadioGroup1" value="page1"
   checked>Page 1<br>

  <input type="radio" name="RadioGroup1" value="page2">
    Page 2<p>
    <input type="submit" name="Submit" value="Submit">

</form>

in choosepage.asp
<%
Option Explicit
Dim strChoice

strChoice = Request.Form("PageChoice")

If strChoice = "Page" Then
    Response.Redirect "page1.html"
Else
    Response.Redirect "page2.html"
End If
%>

So there will be page1.html, page2.html.

I just wonder if php can do like that.

1. you must use javascript, cause php ise server-side language...

2. you need to call header("Location: somepage.htm") to redirect to another page...