[PHP] When are Form Variables Null?

[Al Baker]

Hi,

I've been wondering the behavior of browsers and POST submissions..
basically I'd like to know the behavior of:
is_null(), empty(), and isset().

I've found that sometimes when an item is not filled out, the variable
is still set on the subsequent page, like $_POST['var'] = "";

What does everyone use to see if forms were submitted correctly?

I built my own function:
function form_exists($variable)
{ 
        if (strlen($variable) < 1)
        {
                return false;
        } else {
                return true;
        }
}

It was the only apparent way I could know *for sure* that independent of
the browser, I knew what the heck was being submitted.

Thoughts?

Thanks,
Al


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