isset($var) question

From: Greg (greg_at_aperfectnumber.com)
Date: 03/28/05 

Date: Mon, 28 Mar 2005 02:17:56 -0800

I have a question about the isset function. I was writing a script that
would check if a form was submitted and if there were values for all form
fields. Something like this:

FORM >submits to formhandler.php

<?

$name = $_POST['name'];
$date = $_POST['date'];

if (!isset($name) || !isset($date) )

    {
        do something;
    }

else if (isset($name) && isset($date) )

    {
        do something else;
    }

?>

The problem is that it would not recognize if the values were there or not,
and always executed the else statement. The fix was to change the "
if (!isset($name) || !isset($date) )" line to "if (!$name or !$date)" My
question is why it was not working before. Is the syntax not proper?

Thanks,

Greg

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