PHP Help: Undefined Index

[Tuts]

I'm currently using XAMPP and practising some PHP, however I've stumbled across a small problem.

I won't post all of my code as it's extremely long, so I'll post a section of it. We're dealing with buttons and performing actions after a button has been pressed.

<input type="submit" name="submit" />

<?php
    if($_POST['submit'])
    {
        echo 'You\'ve pressed the submit button!';
    }
?>

This piece of code throws this error, Notice: Undefined index: submit in C:\xampp\htdocs\test.php on line 4 (Line 4 is this code - if($_POST['submit'])). Does anyone know the problem with this code? When I click on the submit button, it doesn't echo out "You've pressed the submit button!".

Help would be appreciated.

[iAdam]

Undefined index means you're trying to evaluate a variable, or in this case an element of an array, that doesn't exist at that point in the run of the code. Also, please say that button is in <form> tags.

[Recursion]

Post the rest of your code. $_POST['submit'] isn't set.

[Chippiewill]

you may may want to use if(isset($_POST['submit'])) instead

[Dentafrice]

$_POST is an array, 'submit' is the index that you're trying to pull out of the array. You're trying to get and check it when it's not there.