How to upload images and files using php

Hi, welcome to this new tutorial on how to upload images and files using php. For very long time, this topic has been treated by many and up to now it remains a big mystery for beginners. I intend in this tutorial to give you some clear steps and keys that can help you in understanding how that can be done in the simplest way. For better understanding, I suggest you read deeply about Global variables and PHP arrays. This two elements are key for such systems. Now, if you feel this tutorial as outdated, I believe you may be a guru in PHP. Please I invite you to help others to understand it better by contributing with your comments.