If you create the following four files and place them in the same directory as each other, when index.php is visited, each of the following files will be included. There are several different types of includes. include(), include_once(), require() and require_once(). They're all used in the same way, simply specifying the filename as the parameter so include('header.html'), include_once('header.html'), require('header.html') and require_once('header.html'). The difference between include and require is that if you're using require, and the file isn't found, the page won't continue loading, however with an include, the page will just load without that include. The addition of _once simply checks if that file has already been included, and if so, doesn't include it again.
index.php
<?php include('header.html'); ?>
<?php include('content.html'); ?>
<?php include('footer.html'); ?>
header.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Page</title>
</head>
<body>
<div id="content">
content.html
<p>Any content placed in this file is positioned in between the <div id="content"> and the </div> tag in the header and footer, respectively.</p>
footer.html
</div>
</body>
</html>
Linear Mode
