Definition: "SessionWrite.php" is a PHP script that's used to generate HTML files with JavaScript code. It's often found within WordPress plugins, where it serves as a "template engine" for generating dynamic pages, including scripts and CSS. The purpose of this file is to add JavaScript functionality directly into an existing page without having to re-type the entire source code for each page. The script includes a function called "writeScriptToFile", which takes an HTML string as input and writes it to a specified location within the WordPress files directory (usually `/wp-content/uploads/2016/07/session.js`). The output is then saved as a separate file named `sessionWrite.php`, where the page's unique ID or session name is inserted. This way, when users open their WordPress site, they can see dynamic JavaScript functionality added to the pages without needing to update their browser settings manually. This feature allows plugins and themes to be more flexible with how they style and generate HTML files within their theme directories without having to rewrite entire content into CSS.