phpTools\addJS('filename.js');This will add the `filename.js` file to the current web page. Description: The `phpTools\addJS` function allows PHP developers to add a JavaScript file to a web page. This function takes one parameter, which is the name of the JavaScript file that needs to be added to the web page. The addJS function can be used in various web development scenarios where a JavaScript file needs to be added to a web page. For example, when creating a web application that uses JavaScript to perform client-side validation or when adding JavaScript functionality to a web page, PHP developers can use the addJS function to easily add the necessary JavaScript files to the page. Package/Library: The php Tools is a package/library that provides various tools and functions for PHP developers. It is not clear which particular package/library the addJS function belongs to. It could be part of a larger package/library that provides JavaScript-related functions and tools for PHP developers.