<!DOCTYPE html> <html lang="en" xmlns="http://www.w3.org/1999/xhtml"> <!-- Our first PHP-enabled HTML document...? by: Sharon Tuttle last modified: 2024-03-19 you can run this using the URL: https://nrs-projects.humboldt.edu/~st10/s24cs328/328lect09-1/328lect09-1-play1.php made the XHTML version for strict-validation using: php 328lect09-1-play1.php > 328lect09-1-play1.xhtml --> <head> <title> 328lect09-1-play1 </title> <meta charset="utf-8" /> <?php /*=== function: square: float -> float purpose: expects a number, returns the square of that number examples: square(2.5) == 6.25 square(4) == 16 ===*/ function square($num) { return $num * $num; } ?> <link href="https://nrs-projects.humboldt.edu/~st10/styles/normalize.css" type="text/css" rel="stylesheet" /> </head> <body> <h1> Our First PHP-enabled document! </h1> <?php // Note the PHP expression tags below // calling the PHP function square. ?> <p> Please show me the square of 2.5: <?= square(2.5) ?> </p> <p> Please show me the square of 4: <?= square(4) ?> </p> <footer> <hr /> <p> Validate by pasting .xhtml copy's URL into<br /> <a href="https://validator.w3.org/nu"> https://validator.w3.org/nu </a> or <a href="https://html5.validator.nu/"> https://html5.validator.nu/ </a> </p> </footer> </body> </html>