A PHP developer is a professional who specializes in using PHP (Hypertext Preprocessor) to create dynamic web applications and websites. It is embedded in HTML and executed on the server, generating dynamic content that is then sent to the client's web browser. PHP developers write, test, and maintain the code for web applications. This involves ensuring that the code is efficient, secure, and adheres to best practices in coding standards. Regular testing is crucial to identify and fix bugs or issues. PHP developers integrate user-facing elements developed by front-end developers with server-side logic. PHP developers primarily focus on creating server-side logic, handling database interactions, and ensuring the smooth functioning of web applications.