Error occured in php during registeration

Question

I am new to php and I am making a simple registration form and storing the values in database, this include texts as well as image.
But during submit button I am getting an error Fill all the details which I am not expecting.
Here is the registration form

<form action="php scripts\register.php" method="post" enctype="multipart/form-data">
 <fieldset>
  <legend>Event Registeration</legend>
  <div class="left">Full Name</div> <div class="right"><input type="text" required = "required" placeholder="e.g. : Sachin Sharma" name = "full_name"></div><br><br>
  <div class="left">Mobile</div><div class="right"><input type="text" required = "required" placeholder="+91" name= "mobile_number"></div><br><br>
  <div class="left">Email</div> <div class="right"><input type="text" required = "required" name = "email" placeholder="email"></div><br><br>
  <div class="left">ID</div><div class="right"><input type="file" required="required" name="ID" id="id_card"></div><br><br>
  <div class="left">Registeration type</div><div class="right"> <select name="registrationType">
  <option value="student">student</option>
  <option value="teacher">teacher</option>
  <option value="principle">principle</option>
  <option value="other">Others</option>
</select></div><br><br>
  <div class="left">Number</div><div class="right"><input type="number" value="1" name = "number" required="required"></div><br><br>
  <button class="preview">Preview</button><button class = "submit">Submit</button>
 </fieldset>
</form>

This is the register.php file

<?php
require_once 'DB_Functions.php';
$db = new DB_Functions();
if(var_dump(isset($_POST['full_name'],$_POST['mobile_number'],$_POST['email'],$FILES['IDCard'],$_POST['registrationType'],$_POST['number']))){
    $full_name = $_POST['full_name'];
    $mobile_number = $_POST['mobile_number'];
    $email = $_POST['email'];
    $idCard = $FILES['ID'];
    $registrationType = $_POST['registrationType'];
    $number = $_POST['number'];
    //Check if the user exist
    if($db->isUserExisted($mobile_number)){
        die ("You have already registered");
    }
    else{
        $user = $db->storeUser($full_name,$mobile_number,$email,$idCard,$registrationType,$number);
        if($user){
            echo "You have successfully registered";
        }
        else{
            die ("Unknown error occured during registeration");
        }
    }
}
else{
    echo "Fill all the details";
}
?>

And this is the DB_Functions.php file

public function saveUser($fullName,$mobileNumber,$email,$IDCard,$registerationType,$numberofTickets){
        $uuid = uniqid('',true);
        $target_dir = "latitude_fintech/userPictures/";
        $target_file = $target_dir . basename($_FILES["IDCard"]["name"]);
        $uploadOk = 1;
        $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
        $check = getimagesize($_FILES["IDCard"]["tmp_name"]);
        if($check !== false) {
            echo "File is an image - " . $check["mime"] . ".";
            $uploadOk = 1;
        } else {
            die("File is not an image.");
            $uploadOk = 0;
        }
        // Check if file already exists
        if (file_exists($target_file)) {
            die("Sorry, file already exists.");
            $uploadOk = 0;
        }
        // Check file size
        if ($_FILES["IDCard"]["size"] > 500000) {
            die("Sorry, your file is too large.");
            $uploadOk = 0;
        }
        // Allow certain file formats
        if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" ) {
            die("Sorry, only JPG, JPEG & PNG files are allowed.");
            $uploadOk = 0;
        }
        if ($uploadOk == 0) {
            die("Image should be png or jpg type only.");
        }
        else{
            if (move_uploaded_file($_FILES["IDCard"]["tmp_name"], $target_file)){

        //Store information
        $stmt = $this->conn->prepare("INSERT INTO registeration_table(uniqueId, fullName, mobileNumber, email,idCard,registerationType,Tickets,
        registerationDate) VALUES(?,?,?,?,$target_dir,?,?,NOW())");
        $stmt->bind_param("sssssss",$uuid, $fullName,$mobileNumber,$email, $idCard, $registerationType,$numberofTickets);
        $result = $stmt->execute();
        $stmt->close();
        //Check for store
        if ($result) {
            $stmt = $this->conn->prepare("SELECT * FROM registeration_table WHERE mobileNumber = ?");
            $stmt->bind_param("s", $mobileNumber);
            $stmt->execute();
            $user = $stmt->get_result()->fetch_assoc();
            $stmt->close();
            return $user;
        } else {
            return false;
        }
        }
        else {
                die("Sorry, there was an error uploading your file.");
        }
        }
    }

Any help would be highly appreciated
Thanks you.

Answer 1

why you are checking isset($_POST['ID'])

there is no field name as 'ID' in your form. Yes you have 'IDCard' as field name.

But it is file type so you can get its data using "$_FILES" not "$_POST"