Creating an AWS Lambda function for PHP using Bref has become more approachable due to added libraries and functionality from cloud providers, making it easier for developers to create custom runtimes. To do this, developers need to install PHP locally, set up their AWS credentials, install the Serverless Framework and Bref tool, initialize a new project with Bref, and configure their serverless.yml file. Once deployed, they can test their function using the AWS Console or the Serverless CLI. The example application does not include authentication or verification, so developers should secure it if intended to be used publicly. With this setup, developers can continue adding more code and creating robust PHP apps leveraging serverless technologies.