Suppose I want to make a form for entering a new species of okaymon.



enter the name of species: <input type='text' name='species' />

enter the weight:
   <input type='text' name='weight' />

energy type:

Would like a function to produce the html for *any* dropdown:
   /* dropdown : string, string[] -> string */
   function dropdown( $name, $options )

   example:
   $energies = array("puddle","spark","clover","dirt"); 

   test( dropdown( "energy", $energies ),
"  <select name='energy'>
     <option value="puddle">puddle</option>
     <option value="spark">spark</option>
     <option value="clover">clover</option>
     <option value="dirt">dirt</option>
   </select>" );

How to let people enter what energies this species is weak to?
   weak to:
     __ puddle
     __ spark
     __ clover
     __ dirt

   resistant to:
     __ puddle
     __ spark
     __ clover
     __ dirt
Hmm, two sets of check-boxes would allow the user to
input inconsistent info.

We'll try a table full of radio buttons:

           weak      neutral     resistant
   puddle:   O          O            O       
   spark:    O          O            O        
   clover:   O          O            O         
   dirt:     O          O            O      



Let's make a function to create these things!
    // radioTable : string, string[], string[] -> string
    function radioTable( $id,   $rowNames, $colNames )

    radioTable( $energies
                array("weak", "neutral", "resistant") )
    test( radioTable( "fruitses",
                      array("apples", "bananas", "kumquats"),
                      array("blech", "yummy") ),
<<<MY_SAMPLE_OUTPUT
<table id='fruitses'>
  <tr>
    <td></td>
    <th>yech</th>
    <th>yummy</th>
  </tr>

  <tr>
    <th>apples</th>
    <td><input type='radio' name='fruitses[apples]'  value='blech' /></td>
    <td><input type='radio' name='fruitses[apples]'  value='yummy' /></td>
  </tr>
  <tr>
    <th>bananas</th>
    <td><input type='radio' name='fruitses[bananas]'  value='blech' /></td>
    <td><input type='radio' name='fruitses[bananas]'  value='yummy' /></td>
  </tr>
  <tr>
    <th>kumquats</th>
    <td><input type='radio' name='fruitses[kumquats]'  value='blech' /></td>
    <td><input type='radio' name='fruitses[kumquats]'  value='yummy' /></td>
  </tr>
</table>
MY_SAMPLE_OUTPUT 
        );

                blech      yummy    
   apples:        O          X
   bananas:       X          O
   kumquats:      X          O

// later, in the form handler
   $_POST['species'] === "Mewthree"
   $_POST['weight'] === "32"

   I want something "$_POST['fruitses']" === array( "apples" => "blech",
                                                    "bananas" => "yummy",
                                                    "kumquats" => "yummy" );
    We can indeed do this by making 
    each radio-button's name attr. start with "fruites[...]"

   Now we have:
   $_POST['fruitses']['apples'] === "blech"
   $_POST['fruitses']['bananas'] === "yummy"
   $_POST['fruitses']['kumquats'] === "yummy"




    test( radioTable( "fruitses",
                      array("apples"),
                      array("blech", "yummy") ),
<<<MY_SAMPLE_OUTPUT
<table id='fruitses'>
  <tr>
    <td></td>
    <th>yech</th>
    <th>yummy</th>
  </tr>

  <tr>
    <th>apples</th>
    <td><input type='radio' name='fruitses[apples]'  value='blech' /></td>
    <td><input type='radio' name='fruitses[apples]'  value='yummy' /></td>
  </tr>
</table>
MY_SAMPLE_OUTPUT 
        );


    test( radioTable( "fruitses",
                      array(),
                      array("blech", "yummy") ),
<<<MY_SAMPLE_OUTPUT
<table id='fruitses'>
  <tr>
    <td></td>
    <th>yech</th>
    <th>yummy</th>
  </tr>
</table>
MY_SAMPLE_OUTPUT 
        );

    test( radioTable( "fruitses",
                      array(),
                      array() ),
<<<MY_SAMPLE_OUTPUT
<table id='fruitses'>
  <tr>
    <td></td>
    <th>yech</th>
    <th>yummy</th>
  </tr>
</table>
MY_SAMPLE_OUTPUT 
        );