Passing variables

[RobP]

This should be a nice and simple one for you all........

I have a radio box list on one page. So when I select a box and then submit it, the name of the checked box gets passed to a new page.

I need some script to determin which one of the boxes has been checked.

Any ideas???

[siwis]

Use "switch()"

switch ($variablename)	{
	case "this":
		//Do This
		break;
	case "that":
		//Do That
		break;
	case "theother":
		//Do The Other
		break;
	default:
		//Deafault Action. Invoked only if none of the defined cases are triggered
}

[laserlight]

Consider a simple series of radio buttons:

<p>
<input type="radio" name="life" value="ant">Ant<br>
<input type="radio" name="life" value="bird">Bird<br>
<input type="radio" name="life" value="cat">Cat
</p>

<p>
<input type="radio" name="stuff" value="armchair">Armchair<br>
<input type="radio" name="stuff" value="bed">Bed<br>
<input type="radio" name="stuff" value="curtain">Curtain
</p>

Now, if the form is sent by the POST method, i.e. method="post" in the form tag, then you can access the first set of radio buttons with:
$POST['life']
and the second set with:
$POST['stuff']

If the user selects 'Cat' and 'Bed' and submits it, then $POST['life'] == 'cat' and $POST['stuff'] == 'bed'

Generally, for radio buttons (and check boxes), if the field has been selected (or checked), it would be set in the $_POST array.

As such, determining which radio button has been selected is a matter of determining if it is set in the $_POST array, then comparing its value with whatever values are expected.

[RobP]

Does this mean if I write

echo $_POST['life'];

it will display the checked value, cos it doesnt seem to be working at this end??

[siwis]

it needs to be

$_POST['yourfieldname'];

OR

$HTTP_POST_VARS['yourfieldname'];

assuming that the method of your form is POST.

Substitute the name of your radio button field for "yourfieldname" but leave the single quotes intact.

[RobP]

Does this mean if I write

echo $_POST['life'];

it will display the checked value, cos it doesnt seem to be working at this end??

[siwis]

Why the duplicate response???

echo $_POST['life']; will only display an entry if one of the fields in your form that you POST to the receiving script is named (id'd) "life" ie

<input type="radio" name="life" value="myvalue">

[RobP]

Sorry it was an accident....
I think I have it sorted now
Cheers