<?php include "AgeCalculator.php"; ?> <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Input Age</title> </head> <body> <form> <input type="date" name="birthday"> <input type="submit" name="submit"> </form> <?php var_dump($_GET); if (isset($_GET['submit'])) { $birthday = $_GET['birthday']; $ageCalculator = new AgeCalculator(); $ageCalculator->setBirthday($birthday); echo $ageCalculator->calculateAge(); } ?> </body> </html>