Source Code for /public/02-hello-world/closed-on-mondays.php

<?php
/*
 * date('w') returns the day of the week as a number:
 * 0 is Sunday, 1 is Monday ... 6 is Saturday etc.
 */
if( date('w') === '1' ) {
  /*
   * This code tells the browser to show a "403" error page.
   * 403 is the error code for "Forbidden"!
   */
  header('HTTP/1.1 403 Forbidden');

  echo "This page can't be read on Mondays";

  /*
   * The die(); command stops the PHP script immediately!
   * No code after this will be run or sent to the browser.
   */
  die();
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>The Non-Monday Page</title>
</head>
<body>
  <h1>It's not a Monday</h1>
  <p>
    It's not a Monday, so you can read this page! Lucky you!
  </p>
</body>
</html>