How to redirect form to a verification code?

Question

How to redirect form to a verification code?

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#1 by (1 votes)

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When the user clicks "Sign up," the service asks you to enter the security check words. If you can not read what is written, you can click on the "Try different words" link, or you can hear the words by clicking on "a sound captcha".

php html captcha

asked by anonymous 02.10.2014 / 05:45

1 answer

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score 1 · Answer 1

Captcha (by Wikipedia )

CAPTCHA is an acronym for the expression "Completely Automated Public Turing test to tell Computers and Humans Apart" (a fully automated public Turing test for differentiation between computers and humans): a cognitive challenge test, used as an anti-spam tool, pioneered at Carnegie-Mellon University. As the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, this test is actually correctly described as a reverse Turing test.

An example of captcha with reCAPTCHA

Link to key request to use the API

Sample HTML form with excerpt:

<form method="post" action="verify.php">
    <?php
        require_once('recaptchalib.php');
        $publickey = "your_public_key"; // cadastre-se no link informado acima
        echo recaptcha_get_html($publickey);
    ?>
    <input type="submit" />
</form>

Excerpt to server-side validate:

<?php
  require_once('recaptchalib.php');
  $privatekey = "your_private_key"; // observe a imagem em anexo.
  $resp = recaptcha_check_answer ($privatekey, $_SERVER["REMOTE_ADDR"], $_POST["recaptcha_challenge_field"], $_POST["recaptcha_response_field"]);

  if (!$resp->is_valid) {
      // seu fluxo caso o usuário tenha errado o captcha
  } else {
      // seu fluxo caso o usuário tenha acertado o captcha
  }
?>

Additional information after you sign up for API usage:

Source and additional documentation

A curiosity about reCAPTCHA (offtopic, by Wikipedia )

The reCAPTCHA service provides, for words that optical character recognition (OCR) software does not was able to identify. These registered sites (which your purposes are not usually related to project scanning) present these images to humans decipher as CAPTCHAs, as part of your procedure normal validation. Then they return the results to the service reCAPTCHA, which sends these results to the digitization of its projects.