[SOLVED] increment/decrement $_SESSION variable when button is click. Hint header()

increment/decrement $_SESSION variable when button is click. Hint header()

I Initialized a $_SESSION variable = 1 and I want to increment/decrements its value when a link is click. And the links will reload the page then echo the value of the $_SESSION. I was given a hint redired using header() but I still can't figure it how.

<?php  
        if (isset($_SESSION['count'])) {
            $count = $_SESSION['count'];
        } else {
            $count = '';
        }
    ?>
    <a href="index.php?inc=TRUE">Increment</a>
    <a href="index.php?dec=TRUE">Decrement</a>
    <?php if (isset($_SESSION['count'])): ?>
        <?php echo $count ?>
    <?php endif ?>

Solution

<?php 
    session_start();

    if(!isset($_SESSION['count'])
        $_SESSION['count'] = 0;

    $counter = $_SESSION['count']; 
    $counter = (int)$counter;

    if (isset($_GET['inc'])==TRUE) { 
        $counter++;
        $_SESSION['count'] = $counter; 
        header("Location: index.php"); 
    }

    if (isset($_GET['dec'])==TRUE) { 
        $counter--;
        $_SESSION['count'] = $counter; 
        header("Location: index.php"); 
    }
?>

Also You may need to cast $counter to int..