我正在一个非常大的表单上实现reCaptcha（在PHP中） - 如果reCaptcha失败，我如何保留表单数据？

Question

Basically I have a gigantic form that would be a pain for anyone to have to re-fill. We have to implement reCaptcha to prevent spam bots.

I want to make it so that if the user enters the reCaptcha incorrectly, their form data is not lost.

The form, reCaptcha lib, and reCaptcha initialization code are in their own file titled Application.php. This form POSTs to application_confirm.php. application_confirm includes another file which processes the form data into an email format and sends it to the admin.

Application.php is required on another php page (ironically also titled application.php -- this is the one the user visits, and then the form html is included from the previously mentioned Application.php via require('content/Application.php')

I don't really know what I need to do to or where I need to place the captcha validity check -- any help much appreciated!

Answer 1

I like to store the $_POST data into a $_SESSION instead of a javascript approach. When the form is submitted, push the $_POST array into a $_SESSION variable. If the recaptcha fails, reload the form with the value from the $_SESSION. When the form is posted successfully, destroy the session so that if they were to return to the form, it isn't autofilled with old information.

<?php
    session_start();
    $response = recaptcha_check_answer ($privatekey,
            $_SERVER["REMOTE_ADDR"],
            $_POST["recaptcha_challenge_field"],
            $_POST["recaptcha_response_field"]);
    if(isset($_POST['submit']) && !$response->is_valid)
    {
        $_SESSION['form'] = $_POST;
    }
    else
    {
        //Handle form processing
    }
?>

Set value of input field to value from $_SESSION

<input type="text" name="email" value="<?= $_SESSION['form']['email'] ?>" />