PHP: Get textbox value from HTML input tag

Question

I got a very simple problem and I've searched for it for hours. But I just don't fix my error... I try to get the value of my textbox (I know, there are lots of posts but no one of them could've helped me).

I got this HTML code:

<form action="" method="post">
    <input type="text" id="address" name="address" placeholder="Enter your zip code" style="width:250px;" />
    <input type="submit" id="submit" value="Submit" />
</form>

And this is PHP code #1 I tried:

<?php
    $textboxValue = $_POST['address'];
    echo $textboxValue;
?>

This doesn't work and I don't know why. After trying this, I found another code:

<?php
    if(isset($_POST['submit'])){
        $textboxValue = $_POST['address'];
        echo $textboxValue;
    }
?>

This doesn't seem to work. Like the other one.

Is there an error or why is the $textboxValue not displayed when I call it with echo?

Answer 1

Please give the form an action!

And you have to name the submit button submit:

<input type="submit" name="submit" id="submit" value="Submit" />

Otherwise isset() will return false.

Answer 2

I found the error. In my file I had a return = false; so he couldn't execute the $_POST method. But thanks for all your help :)