What are the limitations of using PHP for client-side functionalities like bookmarking?

PHP is a server-side language, meaning it runs on the server and generates HTML to be sent to the client's browser. Therefore, it cannot directly interact with the client's browser to handle client-side functionalities like bookmarking. To implement bookmarking functionality, you would need to use client-side languages like JavaScript, which can manipulate the browser's DOM and handle user interactions.

// This is a PHP code snippet, but it cannot be used for client-side functionalities like bookmarking