A PHP developer is responsible for writing server-side web application logic. PHP developers usually develop back-end components, connect the application with the other (often third-party) web services, and support the front-end developers by integrating their work with the application. PHP developers skilled in both client-side and server-side make them highly potential candidates for any development career opportunities in PHP. They are highly valued as they are adept at handling both Client-side and Server-side.