invisio v2.0

<?php
include('../../../config/main_function.php');
$secure = "cAh3DrJACzw4RbU";
$connection = connectDB($secure);

$register_type = mysqli_real_escape_string($connection, $_POST['register_type']);
$register_level = mysqli_real_escape_string($connection, $_POST['register_level']);

if ($register_level == '0') {
    $access_level = "visitors_access = '1'";
} else if ($register_level == 'g9k1s') {
    $access_level = "general_access = '1'";
} else if ($register_level == 'kki22') {
    $access_level = "extraordinary_access = '1'";
} else if ($register_level == 'x9fkq') {
    $access_level = "ordinary_access = '1'";
}

if ($register_type == '0') {
    $access_type = "";
} else if ($register_type == '1') {
    $access_type = "AND employer_access = '1'";
} else if ($register_type == '2') {
    $access_type = "AND company_access = '1'";
} else if ($register_type == '3') {
    $access_type = "AND agency_access = '1'";
} else if ($register_type == '4') {
    $access_type = "AND worker_access = '1'";
}

$sql = "SELECT * FROM tbl_setting_slide WHERE $access_level $access_type ORDER BY create_datetime DESC";
$res = mysqli_query($connection, $sql);

?>
<div class="col-lg-12 mb-2">
    
    <div id="carouselExampleControls" class="carousel slide" data-ride="carousel">
        <div class="carousel-inner">
            <div class="carousel-item active">
                <img class="d-block w-100" src="img/slide_1.png" alt="First slide">
            </div>
            <?php while ($row = mysqli_fetch_assoc($res)) { ?>
                <div class="carousel-item ">
                    <img class="d-block w-100" src="../files/slide_files/<?php echo $row['slide_image'] ?>">
                </div>
            <?php } ?>
        </div>
        <a class="carousel-control-prev" href="#carouselExampleControls" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#carouselExampleControls" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</div>