PHP code with $_GET function is not working, no errors

Question

I have written a simple PHP code:

<?php
    if (isset($_GET['day']) && isset($_GET['date']) && isset($GET['year'])) {
        $day = $_GET['day'];
        $date = $_GET['date'];
        $year = $_GET['year'];
        if (!empty($day) && !empty($date) && !empty($year)) {
            echo 'It is '.$day.' '.$date.' '.$year;
        } else {
            echo 'Fill in all fields.';
        }
    }
?>

<form action="index.php" method="GET">
    Day:<br><input type="text" name="day"><br>
    Date:<br><input type="text" name="date"><br>
    Year:<br><input type="text" name="year"><br><br>
    <input type="submit" value="Submit">
</form>

To me, everything looks OK. No errors after running. But, neither the output. Non of the echos shows up. Form is there and I enter data, but when I click "Submit", it just stays the same. URL of the page changes and I can see entered data there, but no echos on the page. I have checked the code for spelling errors, and I haven't found any. Thanks in advance.

Answer 1

It is $_GET not $GET

You need to add an underscore:

$GET['year']

to:

$_GET['year']     

Answer 2

You forgot an underscore at this:

 if (isset($_GET['day']) && isset($_GET['date']) && isset($GET['year'])) {

at the last get

 if (isset($_GET['day']) && isset($_GET['date']) && isset($_GET['year'])) {