1You can’t.
2
3PHP is a server side language. That means, whenever you request
4content from any website built with php, the server will send
5the rendered content i.e. HTML, CSS and JS,
6that means all the PHP code is firstly rendered to HTML
7and then it is sent to your browser, that is why you see only
8the HTML, CSS and JS whenever you view the source of any webpage.
9
10That’s why you cannot see the PHP code for any website.