i am doing something like this
$some_var='<!DOCTYPE html>
<head>
<title>questions '.$suto.'</title>
<meta charset="utf-8" />
<meta name="description" content="question need to'. $suto.'">
'. include ("header.php") .'
<body>
There is more code below which is working that's why not posting here.
Everything works instead the include function.