如何用href调用函数？

Question

I´m trying to call a function into a href, my function is on functions.php and my href is on views/something.php

so, this is my function:

function discount($connection, $us){
    $discount = $conexion->prepare("UPDATE postule SET seen = 1 WHERE id = $us");
    $discount->execute();
    return $discount;
}

and my link button is on an <li> (not in a form):

<?php foreach ($total_notu as $notu) : ?>
    <li><a onClick="<?php discount() ?>" href="notificaciones.php"> Notificaciones <span class="badge "><?php echo "$notu[0]"; ?></span></a></li>
  <?php endforeach; ?>

(Do not pay attention to the foreach)

Answer 1

You'll need to change this to use an ajax call or form post to call the PHP function.

Here's a really basic example which should point you in the right direction

discount.php

<?php

    // Load $connection from somewhere

    // Get user, it's better to get this from a cookie or session rather than GET
    $user = $_GET['user']

    $discount = $connection->prepare("UPDATE postule SET seen = 1 WHERE id = :user");
    $discount->bindParam(':user', $user);
    $result = $discount->execute();

    // Throw error if something went wrong with the update, this will cause $.ajax to use the error function
    if (!$result) {
        http_response_code(500);
    }

html, assuming $notu[0] contains the user id

<?php foreach ($total_notu as $notu) : ?>
    <li><a onClick="return callDiscount('<?php echo "$notu[0]"; ?>');" href="#"> Notificaciones <span class="badge "><?php echo "$notu[0]"; ?></span></a></li>
<?php endforeach; ?>

js, requires jquery

function callDiscount(user_id)
{
    // Perform ajax call to discount.php
    $.ajax({
        url: '/discount.php?user=' + user_id, 
        error: function() {
            alert('An error occurred');
        },
        success: function(data) {
            // Redirect user to notificaciones.php
            document.location = '/notificaciones.php';
        }
    });

    // Prevent link click doing anything
    return false;
}