index variables?

[Anon]

I've just installed PHP on W2000 and I get the following messages when I run a view page in IE6.0.

Warning: undefined index: action in admin\manage_results.php on line 2

Warning: undefined index: nextaction in admin\manage_results.php on line 3

This error never used to occur when I last had php installed. I am trying to retrieve variables from $HTTP_GET_VARS/$HTTP_POST_VARS.

Is it something wrong with the set-up e.g. track-vars??

Thanks in advance.

[[deleted]]

"Is it something wrong with the set-up e.g. track-vars??"

Probably not.

Most likely the error has been there all along, but your 'old' setup had error reporting switched off so you never saw the errors.

Fix: use proper error checking to make sure you never reference a variable that was not set.

[Anon]

So how do I declare variables? Currently
I am using $HTTP_GET_VARS['action'] to retrieve the $action variable but if I can't use this method then how do i get it!

I've tried looping through the $HTTP_GET_VARS array (and use the count() function to get a total no of elements), but how do I find out if the action variable is in there without using $HTTP_GET_VARS['action'] without getting an error?

Thanks for any help

[[deleted]]

You 'declare' them by just putting them in a URL or a FORM.

You check for them by using the isset() function:

if (isset($var))
{
// $var is set
}
else
{
// $var is not set
}

Or in the case of URL parameters:

if (isset($HTTP_GET_VARS['var']))
{
// $var is set
}
else
{
// $var is not set
}

and for FORM data:

if (isset($HTTP_POST_VARS['var']))
{
// $var is set
}
else
{
// $var is not set
}

[kransom]

thank you for your help.
I'm obviously new to the language and appreciate your help.

Thanks