How To Write the FORM Tag for Uploading Files in PHP

<form action="imageupload.php" method="post" enctype="multipart/form-data">
    Image to upload:
    <input type="file" name="image" id="image">
    <input type="submit" name="submit" value="Upload Image">
</form>

if(isset($_POST["submit"])) {
    $image_name=$_FILES["image"]["name"];
    $image_tmpname=$_FILES["image"]["tmp_name"];

    $target_file="images/".$image_name;
   if (move_uploaded_file($_FILES["image"]["tmp_name"], $target_file)) {
         echo "The file ".$_FILES["image"]["name"]. " has been uploaded successfully.";
   } else {
         echo "Sorry, file not upload.";
   }
}