Uploading the files to a server is a common task in web development.
In PHP you can easily upload any type of file on the server using the move_uploaded_file() method. But it requires a form to be submitted for uploading the selected file.
You can make this process smoother with jQuery AJAX, it also improves user experience. You can directly display the image or file preview after it is been uploaded or alert an error if file is not validated without reloading the page.
FormData object is use to pass the selected file to the server using AJAX.
In this tutorial, you’ll learn step-by-step how to use PHP jQuery, and AJAX to upload files with validation and display its preview.