Question

I have a rough php script that sees if a user has filled in the html form input after they have clicked submit. I am having a problem with getting isset() and is_string() to work. If I use isset() the form is emailed even if the form inputs are left blank, is_string() throws an error messages even if the form input are filled in. I have tried !isset() and that still sends blank input. The only thing working is if I use == NULL. At this moment in time I am not going to validate the input as I am trying to understand why this isn’t working as I am pretty new to PHP.

$subject = "Feedback from Your Website.";
$email = ($_POST['email']);
$name = ($_POST['name']);
$message = ($_POST['feedback']);

if (isset($_POST["name"]))
{
    //send message
    mail($subject, $name, $email, $message);
}

else
{
    //error message
    echo "Please do not miss out any fields";
}

I also tried:

if (isset($_POST["name"], $_POST['email']))
{ }

if (isset($name, $email))
{ }

if (is_string($name || $email))
{ }

But all failed, so far all that’s working is:

if ($name == NULL || $email == NULL || $message == NULL)
{ }

Thank you in advance.

Answer 1

Try to use empty(). This function return TRUE if a variabile is empty or non set, FALSE otherwise.

if (empty($_POST["name"]) || empty($_POST["email"]) || empty($_POST["feedback"]))
{
    //error message
    echo "Please do not miss out any fields";
}
else
{
    //send message
    mail($subject, $name, $email, $message);
}