Nowadays, is it necessary to integrate AngularJS within our web application built
with PHP ?
What are the differences or advantages between web an application made with Symfony framework and an application that represents a combination of AngularJS and Symfony ?
There is no fundamental necessity to use AngularJS, or any other front-end framework. It solely depends on the requirements of your project. These are used when the front end must be responsive and/or must process input from the user and update parts of the page without the page being refreshed.