Как сделать счетчик просмотра изображений?

<?php
include 'db_connect.php';
mysqli_query ($db, "UPDATE portfolio SET views = views + 1 WHERE id = $id");
?>

$(".views").click (function (
        $.ajax({
            type: "post",
            url: "includes/ajax.php"
        });
    ));

<div class="gallery_block">
<a class="views" href="<?php echo $imageURL; ?>">
<img src="<?php echo $imageURL; ?>" />
</a>
</div>

$(".views").click (function (
        var $this = $(this);
        $.ajax({
            type: "post",
            url: "includes/ajax.php",
            success: function() {
                window.location.href = $this.find('img').attr('src');
            }
        });
        return false;
    ));

<?php
include 'db_connect.php';
mysqli_query ($db, "UPDATE portfolio SET views = views + 1");
?>

<?php
include 'db_connect.php';
mysqli_query($db, "UPDATE portfolio SET views = views + 1");
?>

<?php
include 'db_connect.php';
$imageURL = 'img/portfolio/'.$row["file_name"];
mysqli_query($db, "UPDATE portfolio SET views = views + 1 WHERE id");
?>

<?php
include 'db_connect.php';
$id = $_POST['id'];
mysqli_query($db, "UPDATE portfolio SET views = views + 1 WHERE id = $id");
?>