<html>
  <head>
    <title><?= 'Fibonacci numbers' ?></title>

    <?php
      // PHP has a plethora of comment types
      /* What is a
         "plethora"? */
      function fib($n) {
        # I don't know.
        $a = 1;
        $b = 1;
        while (--$n >= 0) {
          echo "$a\n";
          $tmp = $a;
          $a += $b;
          $b = $tmp;
        }
      }
    ?>
  </head>
  <body>
    <?= fib(10) ?>
  </body>
</html>