Make sure that you access the file via http with the server providing you the output.
At the same time it can be a bit confusing. You can then enter your filename without quotes. The server finds out that this file needs to be interpreted by PHP because you used the ". It also enables beginners and professionals to write scripts in their own ways as it allows procedural as well as object-oriented programming.
Webalizer is an application for analysis and you need to install it for monitoring purposes. Take some time and review this important information.
Its primary function is to deal with emails received by the server. If you wish to use one for this test script, you must ensure that you save the file as plain text or PHP will not be able to read and execute the script.
It can be easily embedded in HTML. You can use PHP to create dynamic web pages, collect form data, and send or receive cookies.