Untitled

<?php
const FINEL_STEP = 4;
        $inputSteps = [];

        $step1 = ['login' => '<input type="%2$s" name="login" value="%1$s" />',
              'age' => '<input type="%2$s" name="age" value="%1$s" />',
              'passwd' => '<input type="%2$s" name="passwd" value="%1$s" />'
        ];

        $step2 = ['first_name' => '<input type="%2$s" name="first_name" value="%1$s" />',
              'second_name' => '<input type="%2$s" name="second_name" value="%1$s" />',
              'sex' => '<input type="%2$s" name="sex" value="%1$s" />'
        ];

        $step3 = ['city' => '<input type="%2$s" name="city" value="%1$s" />',
              'street' => '<input type="%2$s" name="street" value="%1$s" />',
              'home' => '<input type="%2$s" name="home" value="%1$s" />'
        ];

        $step4 = ['postcode' => '<input type="%2$s" name="postcode" value="%1$s" />',
              'phone' => '<input type="%2$s" name="phone" value="%1$s" />',
              'nubmerCard' => '<input type="%2$s" name="nubmerCard" value="%1$s" />'
        ];

    $inputSteps = array(1 => $step1, 2 => $step2, 3 => $step3, 4 => $step4);
    $step = !empty($_GET['step']) ? $_GET['step'] : 1;

        $fields = [];
        $fields['login'] = !empty($_GET['login']) ? $_GET['login'] : '';
        $fields['age'] = !empty($_GET['age']) ? $_GET['age'] : '';
        $fields['passwd'] = !empty($_GET['passwd']) ? $_GET['passwd'] : '';
        $fields['first_name'] = !empty($_GET['first_name']) ? $_GET['first_name'] : '';
        $fields['second_name'] = !empty($_GET['second_name']) ? $_GET['second_name'] : '';
        $fields['sex'] = !empty($_GET['sex']) ? $_GET['sex'] : '';
        $fields['city'] = !empty($_GET['city']) ? $_GET['city'] : '';
        $fields['street'] = !empty($_GET['street']) ? $_GET['street'] : '';
        $fields['home'] = !empty($_GET['home']) ? $_GET['home'] : '';
        $fields['postcode'] = !empty($_GET['postcode']) ? $_GET['postcode'] : '';
        $fields['phone'] = !empty($_GET['phone']) ? $_GET['phone'] : '';
        $fields['nubmerCard'] = !empty($_GET['nubmerCard']) ? $_GET['nubmerCard'] : '';
?>

<!doctype html>
<html lang="en">
<head>
     <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
    <title>Lesson 1</title>
</head>
    <body>
        <?php
            if ($step > FINEL_STEP) {
                echo 'Благодарим за предоставленную информацию:';
                echo '<pre>';
                print_r($fields);
                echo '</pre>';
                exit;
                }

            if (empty($inputSteps[$step])) $step = 1;
                $next_step = $step+1;
        ?>
        <div class="container">
            <div class="row">
        <form action="/lesson1.php" method="GET">
        <?php
            echo '<h2>Шаг '.$step.' из '.FINEL_STEP.'.</h2><p>';
            for ($i = 1; $i < $next_step; $i++) {
                foreach ($inputSteps[$i] as $field=>$input) {
                    if ($i < $step) {
                        '<div class="col-md-12 col-sm-12">';
                        echo sprintf($input,$fields[$field], 'hidden');
                    }else{
                        echo $field.': ';
                        echo sprintf($input, $fields[$field], 'text');
                        '</div>';
                        }
                }
                echo '</p>';
            }
                echo '<input type="hidden" name="step" value="'.$next_step.'" />';
        ?>
        <?php if ($step != FINEL_STEP): ?>
            <button>Перейти к шагу <?= $next_step ?></button>
        <?php else: ?>
            <button>Завершить опрос!</button>
        <?php endif; ?>
            </div>
        </form>
        </div>
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
    </body>
</html>