Regarding multiple image upload using PHP

I am newbie in PHP and i am developing a component where user can upload total 5 images which will be stored in database. Right now my component is able to multiple images but i won't set the limit(only 5 images can be uploaded). Also i want user can see all 5 images and can select any one to use as profile image. I am using code from http://www.codexworld.com/drag-and-drop-file-upload-using-dropzone-php/ for image upload.