PHP/HTML Form Blank Page on Submission

I have a site with a few forms that’s existed for about a year and has always worked when I submit the forms it until the past couple weeks. When the required info is filled out upon submission, the form would previously refresh and display a success message to the user. Now, when I click submit, I am redirected to a blank page.

After some trouble shooting, I found out that if I add an image, everything redirects as it should. However, if the image field is left blank, I am directed to a blank page even though the url in the browser is displaying correctly. I found that if I also remove the image upload portion of the PHP/HTML, the redirect works.

If anyone could give me any suggestions as to how to rectify this issue, I’d greatly appreciate it. I’m hoping it’s a simple fix for some of these that I just happen to be overlooking. I will be happy to clarify anything that isn’t explained well enough the first time around.

Both the HTML and PHP exist in create.php. I will include all PHP and only the pertinent HTML. create.php is using the database table post.

create.php PHP

$msg = "";

//connect to the database
if (!isset($_SESSION['user_id'])) {
  header('Location: ../login.php');

$user_id = $_SESSION['user_id'];
$username = $_SESSION['username'];
$url = $_SESSION['url'];


  $title = $_POST['title'];
  $link = $_POST['link']; 
  $description = $_POST['description'];
  $title = $db->real_escape_string($title);
  $link = $db->real_escape_string($link);
  $description = $db->real_escape_string($description);
  $start = date('Y-m-d', strtotime($_POST['start']));
  $end = date('Y-m-d', strtotime($_POST['end']));
  $user_id = $_SESSION['user_id'];

  if($title && $description){
    $query = $db->query("INSERT INTO post (user_id, title, link, description, start, end) VALUES('$user_id', '$title', '$link', '$description', '$start', '$end')");
      $_SESSION['message'] =  "Offer posted! Click <a href='myoffers.php'>here</a> to view your current offer overview.";
      $_SESSION['message'] =   "error";
    $_SESSION['message'] =   "Please make sure all required fields are filled out!";

  $postid = $db->insert_id;


    for($i=0; $i<count($_FILES["images"]["name"]); $i++)
        $filetmp = $_FILES["images"]["tmp_name"][$i];
        $filetype = $_FILES["images"]["type"][$i];
        $allowed_types =array("jpg", "png", "jpeg", "mp4", "mov", "wmv", "flv", "avi", "gif");
        $filename = $_FILES["images"]["name"][$i];
        $error = null;
        // Get the file extension
        $extension = pathinfo($filename, PATHINFO_EXTENSION);
        // Search the array for the allowed file type
        if (in_array($extension, $allowed_types, false) != true) {
            $error = "ERROR: ILLEGAL FILE TYPE";
            return $error; // or use  exit;
        $temp = explode(".", $_FILES["images"]["name"]);
        $newfilename = time() . '_' . $filename . end(explode($_FILES["images"]["name"]));
        $filepath = "images/".$newfilename;
        move_uploaded_file($filetmp, $filepath);
        $sql = "INSERT INTO images (img_name, img_path, img_type, post_id) VALUES ('$newfilename', '$filepath', '$filetype', '$postid')";
        $result = mysqli_query($db, $sql);



create.php form HTML

<div class="alert alert-error">
                    <?php echo $_SESSION['message']; ?>
                <form action="create.php" method="post" enctype="multipart/form-data">
                  <label>Campaign Title *</label><br>
                  <input type="text" name="title" class="form-control" placeholder="Please enter the title of this offer" required>
                  <label>Description *</label><br>
                  <textarea type="textarea" name="description" id="description" class="form-control" placeholder="Please enter a brief description of this offer" required></textarea>
                  <input type="text" name="link" class="form-control" placeholder="Include a link to an external site if you would like">
                  <input type="hidden" name="size" value="1000000">
                  <input multiple="multiple" name="images[]" type="file" />
                  <label>Campaign Start Date *</label><br>
                  <input type="date" name="start" value="<?php echo date('Y-m-d'); ?>" required>
                  <label>Campaign End Date *</label><br>
                  <input type="date" name="end" value="<?php echo date('Y-m-d'); ?>" required>
                  <div class="required">
                    * indicates a required field
                  <button type="submit" name="submit" value="Submit"class="btn btn-default">Submit</button>

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