Untitled

<?php
$title = "<?php echo 7 + 5?>";
echo $html = "<strong>html page from database</strong>   <script>window.onload = function() {
alert(123456789);
};</script>");

echo htmlentities("<strong>html page from database</strong>");

echo html_entity_decode("<strong>html page from database</strong>");

require_once("view.php");

<!DOCTYPE html>
<html lang="en">
<head>
     <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title><?= $title ?></title>
</head>
<body>
     <?= $html ?>
</body>