Working with Environment Variables in PHP

Environment variables are an effective way to configure PHP applications by keeping settings outside of the code, making it easier to prevent secure credentials from being exposed and maintain applications across multiple environments. In this tutorial, you can learn how to access and set environment variables in PHP using Superglobals, getenv(), apache_getenv(), putenv(), and other methods, as well as how to use .env files for a more convenient approach. It's essential to remember that environment variables should be filtered and validated like any external data to ensure security and maintainability.