<form method="POST">
    <div>
        <?php if(!$data["captcha_valid"]): ?>
        <p class="alert alert-danger" role="alert">Invalid Captcha!</p>
        <?php endif; ?>
    </div>
    <div>
    <label for="address">Your address:</label> <input type="text" name="address" class="form-control" value="<?php echo $data["address"]; ?>">
    </div>
    <div>
        <?php echo $data["captcha"]; ?>
        <div class="text-center">
        <?php
        if (count($data['captcha_info']['available']) > 1) {
            foreach ($data['captcha_info']['available'] as $c) {
                if ($c == $data['captcha_info']['selected']) {
                    echo '<b>' .$c. '</b> ';
                } else {
                    echo '<a href="?cc='.$c.'">'.$c.'</a> ';
                }
            }
        }
        ?>
        </div>
    </div>
    <div>
        <input type="submit" class="btn btn-primary btn-lg" value="Get reward!">
    </div>
</form>