invisio v2.0

<?php
session_start();
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_blog WHERE $access_level $access_type AND active_status = '1' ORDER BY create_datetime DESC";
$res = mysqli_query($connection, $sql);
while ($row = mysqli_fetch_assoc($res)) {
?>
    <div class="col-md-6 ">
        <div class="ibox">
            <div class="ibox-content shadow-sm">
                <div class="row">
                    <div class="col-lg-12">
                        <img <?php echo ($row['blog_image'] != "" ? 'src="../files/blog_files/' . $row['blog_image'] . '"' : "") ?> class="img-fluid">
                    </div>
                </div>

<a href="blog_post.php?blog=<?php echo $row['blog_id'] ?>" class="btn-link">
                    <h2>
                        <b> <?php echo $row['blog_header'] ?></b>
                    </h2>
                </a>
                <div class="small m-b-xs">
                    <span class="text-muted"><i class="fa fa-clock-o"></i>
                        <?php echo date('d M Y', strtotime($row['create_datetime'])) ?>
                </div>

</div>
        </div>
    </div>

<?php } ?>