Split php content in multiple files

Question

I have no idea if there is a technical term for this, so I did not find anything on Google and this site.

My friend, who has been creating websites for many years and actually creating a business, uses a rather unique (for me) system.

It splits its page into 3 parts, a headline, a body and a footer. Inserts them into 3 files, and then includes the header and footer on the body page, leaving only this: (example)

<?php   include_once "Constants/Header.php";    ?>

        <div id="Container">
            <div id="Header">
                HEADER
            </div>

            <div id="Menu">
                <ul id="Nav"> 
                    <li>Menu item</li>  
                    <li>Menu item</li> 
                    <li>Menu item</li>  
                    <li>Menu item</li> 
                    <li>Menu item</li>  
                    <li>Menu item</li> 
                </ul> 
            </div>

            <div id="Body">

            </div>
        </div>

<?php   include_once "Constants/Footer.php";    ?>

Is it good to code the site this way? So why? Last but not least, do you code your pages this way?

Answer 1

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<?php
$active_page = $_GET['page'];
require_once('header.php');
require_once($active_page);
require_once('footer.php');
?>

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