01index.php
<?php
include "02header.php";
?>
<section>
메인페이지
</section>
<?php
include "03footer.php";
?>
02header.php
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div id="wrap">
<header>
<h1><a href="01index.php">Green</a></h1>
<nav>
<ul>
<li><a href="04sub.php">menu1</a></li>
<li><a href="04sub.php">menu2</a></li>
<li><a href="04sub.php">menu3</a></li>
<li><a href="04sub.php">menu4</a></li>
</ul>
</nav>
</header>
03footer.php
<footer>
footer입니다.
</footer>
</div>
</body>
</html>
04sub.php
<?php
include "02header.php";
?>
<section>
서브 페이지 입니다.
</section>
<?php
include "03footer.php";
?>
