<?php
// HereDOC案例
$title ='title';
$boby = '<h1>Hello world</h1>';
$html = <<<CDATA
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset = "UTF-8">
<title>{$title}</title>
</head>
<body>
{$boby}
</body>
</html>
CDATA;
echo $html;