In this tutorial you will learn how to make complete website where you upload multiple files at once and later view, sort, search and download them. The final result resembles online storage service. Files are stored in MySQL database and the server side language used is PHP . You will also learn to use jQuery to make AJAX requests, SWFUpload to upload files to server and understand/fix security issues, including DOS /DDOS attack and SQL injection. To view tutorial just open tutorial.html.