How to view the PHP source code of other people’s websites

There are only a few ways to view this directly:

PHP is a compiled running program. What you see in the browser is the display page after compilation and execution, not the source code. .

Webmasters can freely download the source code of the entire website for public viewing.

The website provides a backend, giving certain groups of people certain management rights. Codes can be released.

Server, for some websites, for some reasons, the server is shared and the source code can be seen.