help with php coding

[nineteen77]

i have this line of code can someone tell me what is wrong with it it sends the form if there is nothing written in the form box
i am trying to send an error message if there is nothing written in the box
and send the form if there is something written in the form text box

if($_POST['formSubmit'] == "Submit")
{

$visitor = $_POST['visitor'];
}

if(empty($visitor))
{
echo "<li>You forgot to enter a name!</li>";

}

can any one help please
cheers

[Obrienray1]

if($_POST['formSubmit'] == "Submit")
{
    $visitor = $_POST['visitor'];
}
else
{
   if($visitor == '')
{
   echo '<li>You forgot to enter a name!</li>';
}
?>

[Bonesnap]

The above code will cause a syntax error since the braces are unbalanced (one too few closing braces).