move_uploaded_file not uploading PHP

I explain all code in this video.
This is how to solve the move upload function in PHP which is not uploading into the destination folder.

[Setiawan-]

this is my script, but it is not work. which is the problem :
<?php
require 'config.php';
$msg="";
if(isset($_POST['submit'])){

$p_name =$_POST['pName'];
$p_price =$_POST['pPrice'];

$target_dir ="image/";

move_uploaded_file($_FILES['pImage']["tmp_name"], $target_file);

$sql="INSERT INTO product (product_name, product_price, product_image)VALUES('$p_name', '$p_price', '$target_file')";

if(mysqli_query($conn, $sql)){
$msg="Product Added to the database Successfully!";
}
else{
$msg="Failed to add the product!";
}
}
?>