Question

I have pre installed GD library and Freetype library in centos server. I am not able to see captcha image.

ERROR:

Call to undefined function imagettfbbox() in /path/public_html/captcha/securimage.php

What could be the reason?

Thanks.

No correct solution

OTHER TIPS

Try using reCAPTCHA. In some hosting servers, GD based captcha doesn't work. I have experienced it. reCAPTCHA can be used with out GD library. It loads captcha images from a external service and validates using public key cryptography. So NO internal generation of captcha images. Very easy to use.

E.G:

Front End :

<html>
    <body> <!-- the body tag is required or the CAPTCHA may not show on some browsers -->
      <!-- your HTML content -->

      <form method="post" action="verify.php">
        <?php
          require_once('recaptchalib.php');
          $publickey = "your_public_key"; // you got this from the signup page
          echo recaptcha_get_html($publickey);
        ?>
        <input type="submit" />
      </form>

      <!-- more of your HTML content -->
    </body>
  </html>

Back End Validation :

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

  if (!$resp->is_valid) {
    // What happens when the CAPTCHA was entered incorrectly
    die ("The reCAPTCHA wasn't entered correctly. Go back and try it again." .
         "(reCAPTCHA said: " . $resp->error . ")");
  } else {
    // Your code here to handle a successful verification
  }
  ?>

For More info Visit : https://developers.google.com/recaptcha/docs/php

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