note 47732 added to function.empty

I want to use empty in a if-function. i want to check, i something wrote something in a testarea, where a text has to be. if (empty($_POST[""])) $vorname = $_POST[""]; { #evaluates true; echo "Fill in all fields<p>"; } i don´t works. Please correct my script. ---- Manual Page -- http://www.php.net/manual/en/function.empty.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+47732 Delete -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes Reason: bad code -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes&reason=bad+code Reason: spam -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes&reason=spam Reason: useless example -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes&reason=useless+example Reason: contains commercial links -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes&reason=contains+commercial+links Reason: useless note -- http://master.php.net/manage/user-notes.php?action=delete+47732&report=yes&reason=useless+note Reject -- http://master.php.net/manage/user-notes.php?action=reject+47732&report=yes Search -- http://master.php.net/manage/user-notes.php