how to link php file with html code example

Example: how to link html with php

/* PHP code can be easily injected into a standard HTML page. As a rule,
 * files with mixed content of that kind have .phtml extention. The workflow
 * is the same as for pure .php scripts: one should setup web-server to 
 * handle .phtml files the same way it handles .php - .phtml should be passed
 * to PHP engine, and the outcome gotta be sent to a visitor. PHP will parse
 * the .phtml and process everything inside tags <?php [..] ?>, ignoring the
 * rest. I.e. the php code pieces in .phtml will be replaced in outcome with
 * results of their processing, and HTML / CSS / JavaScript code in .phtml, 
 * as well as text content, will be displayed in browser as is. The one and
 * only strict rule - your .phtml mixes must always start with PHP tag 
 * sequence <?php ?>, otherwise they won't be preprocessed by PHP engine.
 */

<?php
/**
 * @category Template
 * @package Hello_World
 */

$tpl = 'Hello %s!';
  
?>
<!doctype html>
<html lang="en">
<head>
  <title><?php printf($tpl, 'World'); ?></title>
  <style>
  body {
    text-align: center;
  }
  </style>
</head>
<body>
  <h1><?php printf(
     $tpl, 
    'world of ' . date('Y') . ', the wonderful future world'
  ); ?></h1>
</body>
</html>

<!-- In a browser this template will display "Hello world of 2021,
     the wonderful future world!" with "Hello World!" in title -->

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