How to Write a Secure PHP Script for File Uploads File uploads are a common feature in web applications, but they can introduce significant security risks if not handled properly. In this article, we'll walk through the steps to securely upload files to a server using PHP. We'll cover key security measures such as file validation, limiting file types, setting file size limits, and managing file storage. We will also create reusable functions to handle the upload process. 1. Create the HTML Form First, we need an HTML form that allows users to select and upload a file. Ensure that the form uses the POST method and includes the enctype="multipart/form-data" attribute. <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Secure File Upload</title> </head> <body> <form action="upload.php" method="post" enctype="multipart/