A FULL STACK PHP DEVELOPER is someone who has expertise in both the front-end and back-end aspects of web development using the PHP programming language.

On the front-end, a FULL STACK PHP DEVELOPER would have knowledge of HTML, CSS & JavaScript for creating the user interface and making it interactive. They would also be able to use front-end frameworks and libraries such as jQuery, AngularJS & ReactJS to build responsive and dynamic web pages.

On the back-end, a FULL STACK PHP DEVELOPER would have knowledge of how to write server-side code using PHP. They would be able to work with databases, APIs, and web services to handle server-side logic and process data. They would also be familiar with popular PHP frameworks such as Laravel, CodeIgniter, and Symphony and be able to use them to build web applications.

A FULL STACK PHP DEVELOPER would also have a good understanding of web development principles and be able to work with different tools and technologies as required. They would also have knowledge of testing and debugging techniques for ensuring the quality of the code.