I recommend the next variant
 if ($_POST["msg"] =="hi")

Why?

I've created an html file with form's action parameter as info.php that
contains phpinfo().
The result was

      PHP_SELF  /~adolf/info.php
      _POST["a"] dv fdsvz
      _SERVER["CONTENT_LENGTH"] 10


You see, _POST["a"]


----- Original Message ----- 
From: "nabil" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, October 04, 2003 3:45 PM
Subject: [PHP] PHP Notice: Undefined variable


> I got PHP Notice: Undefined variable
>
> Should I define always any var ?? when do I have do define a var??
>
> example if I want to write
> <?php
> if ($_POST['msg'] =='hi')
> {
> do something ...
> }
> ?>
>
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