I have googled a lot but it seems that I am doing something wrong.

I want to do this:

```
<?php
include 'header.php';
include'CSS/main.css';
...
?>

```

However, my page prints the CSS code. 

Note: I want to use PHP to include the CSS file, and not use

I also do you want to rename my CSS file to a PHP file as some website mentioned. 

Any clues?

Many thanks.