Untitled

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title 3</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="all" href="main.css" />
</head>
<body>
<form autocomplete="off" action="task3.php" method="post">
    Введіть ім'я -    <input required type="text"  name="name" value="<?php  $a=isset($_POST['name']); ?>"><br>
    Введіть прізвище - <input required type="text"  name="surname" value="<?php  $b=isset($_POST['surname']); ?>"><br>
    Введіть вік - <input required type="number"  name="age" value="<?php  $c=isset( $_POST['age']); ?>"><br>
    Введіть email - <input required type="text"  name="email" value="<?php   $d=isset($_POST['email']); ?>"><br>
    <button type="submit">Створити</button><br>
</form>
<?php
error_reporting(0);
class User {

    private $name = "";
    private $surname = "";
    private $age = "";
    private $email = "";
    function __construct($name,$surname, $age, $email){
        $this -> name = $name;
        $this -> age = $age;
        $this -> email = $email;
        $this -> surname =$surname;
    }
    public function renderInfoAboutUser() {
        echo "Користувач:";echo $this->name;echo " ";echo $this->surname; echo "<div></div>";
        echo "Вік: ";echo $this->age;
        echo "<div></div>";
        echo "Email:";echo $this->email; echo "</div>";

    }

}
$user = new User($a,$b, $c, $d);
$user->renderInfoAboutUser();
?>
<br><a href="main.html">На ГОЛОВНУ!</a>
</body>
</html>