include() and require().
Include will continue processing the page even if the file isn't there or readable; while require will fail if the file isn't there or readable.
So an example of this would be:
template.php
PHP Code:
<!DOCTYPE html>
<html>
<head>
<title><?php echo $title; ?></title>
</head>
<body>
<?php echo $content; ?> </body>
</html>PHP Code:
<?php
$title = 'Something';
$content = <<HTML
<h1>Title</h1>
<h2>Sub Title</h2>
<p>Some static text</p> HTML;
require('template.php');