PHP Include code

I searched Google, it didn’t find what I needed.

Back when I was into programming a lot, (high school cause thats when I had programming class) I use to use this code that was the body of the ‘index.php’ file so that it called on files. This would make it easy because I wouldn’t have to make the main layout on every other file.

I believe I had to make the links something like ‘index.php?page=WHATEVER’ That would call the file whatever.html and it will show were the PHP code was written on the ‘index.php’

I have totally forgotten the code and Google didn’t help me. Anyone know what I am talking about and think they can help me by supplying the code?

switch ($_GET["page"])
    {
    case 'whatever':
        $content = "page 1";
        break;
    case 'whatever':
        $content = "page 2";
        break;
    default:
        break;
    } 

function getPage()
      {
         if(isset($_GET['p']))
         {
            $pageName = $_GET['p'];
            switch($pageName)
            {
               case "main":
               $page = "main.html";
               $title = "Home";
               break;
               case "about":
               $page = "about.html";
               $title = "About";
               break;
               default:
               $page = "main.html";
               $title = "Home";
               break;
            }
         }
         else
         {
            $page = "main.html";
            $title = "Home";
         }
         $Info['page'] = $page;
         $Info['title'] = $title;
         return($Info);
      }
$pageInfo = getPage();
$title = $pageInfo['title'];
$page = $pageInfo['page'];
      //loads the include
      function loadInclude($page)
      {
         $pagePath = ("inc/" . $page);
         include($pagePath);
      }
      loadInclude($page);
?>