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Uploading files to Google Drive with PHP
A small PHP/mySQL application for uploading and displaying image galleries using Rackspace Cloud Files
PHP file upload class for single or multiple files with many validations.
How to Upload a File to a Server in PHP
PHP FileUpload library that supports chunked uploads
This PHP class uploads files and manipulates images very easily. It is in fact as much as an image processing class than it is an upload class. Compatible with PHP4, 5 and 7. Supports processing of local files, uploaded files, files sent through XMLHttpRequest.
Handle file uploads in Laravel - the hard way
Simple and convenient file uploads — secure by default
Multiple File Upload with PHP