Part #1: GET Demo

Click below to increase or decrease the ID value and move to the next page.

When you click the DECREASE ID button, the ID value decreases by 3.

When you click the INCREASE ID button, the ID value increases by 4.

0

The note: "?id=0" is indicated in the URL.

ID = 0

DECREASE ID (MINUS 3)     INCREASE ID (PLUS 4)      

Part #2: POST Demo

This example has buttons for increase or decrease. This changes the value of the subsequent ID.

ID = 0

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CODE FOLLOWS

<?php
include('includes/header.php');
error_reporting(E_ALL);

$id = isset($_GET['id']) ? $_GET['id'] : 0;

?>

<h1>Part #1: GET Demo</h1>
<h2>Click below to increase or decrease the ID value and move to the next page.</h2>
<h2>When you click the DECREASE ID button, the ID value decreases by 3.</h2>
<h2>When you click the INCREASE ID button, the ID value increases by 4.</h2>
<?php echo($id); ?>
<p>
    The note: "?id=<?php echo($id); ?>" is indicated in the URL.
</p>
<p>
    ID = <?php echo($id); ?>
</p>
<a href="query-get.php?id=<?php echo($id - 3); ?>"> DECREASE ID (MINUS 3) </a> &nbsp; &nbsp;
<a href="query-get.php?id=<?php echo($id + 4); ?>"> INCREASE ID (PLUS 4) </a> &nbsp;  &nbsp; &nbsp;

<h1>Part #2: POST Demo</h1>
<h2>This example has buttons for increase or decrease. This changes the value of the subsequent ID.</h2>

<?php
$id = isset($_POST['id']) ? $_POST['id'] : 0;
?>

    <p>
        ID = <?php echo($id); ?>
    </p>

    <form action="" method="POST">

        <input type="hidden" name="id" value="<?php echo($id - 5); ?>">
        <input type="submit" name="submit" value="DECREASE">

    </form>
    <br>

    <form action="" method="POST">

        <input type="hidden" name="id" value="<?php echo($id + 5); ?>">
        <input type="submit" name="submit" value="INCREASE">

    </form>

<?php
include('includes/footer.php');
?>

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