How to import/include a CSS file using PHP code and not HTML code?

Question

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

I want to do this:

Answer 1

You can also do the following:

1. Create a php file in includes folder, name it bootstrap_css.php for example

2. paste the css code files to file created above

    ';
   
    $business = '';
   
     echo $minCss;
     echo $business;
   ?>
   

3. in the html header, include the css files as follows