Simple human verification code.

CrackFeed.Com · 03-02-2010, 06:55 PM

I hate captcha and I am sure you do to. Here is an alternative that is abit more fun, to me at least.

Put this into a file named whatever.php:

PHP Code:

  $randnum = mt_rand(1,25);

switch($randnum)

 {

    case 1:

          $botq = 'What is 5 + 3?';

          $bota = '8';

       break;

    case 2:

    $botq = 'What is 3 + 2?';

          $bota = '5';

       break;

    case 3:

????: NamePros.com http://www.namepros.com/code/642705-simple-human-verification-code.html
    $botq = 'What is 5 + 5?';

          $bota = '10';

????: NamePros.com http://www.namepros.com/showthread.php?t=642705
       break;

    case 4:

    $botq = 'What is 2 + 7?';

          $bota = '9';

       break;

    case 5:

    $botq = 'What color is a lemon?';

          $bota = 'yellow';

       break;

    case 6:

    $botq = 'What is 5 + 1?';

          $bota = '6';

       break;

    case 7:

    $botq = 'What is 7 + 7?';

          $bota = '14';

       break;

    case 8:

    $botq = 'What is 8 + 8?';

          $bota = '16';

       break;

    case 9:

    $botq = 'What shape has no corners?';

          $bota = 'circle';

       break;

    case 10:

    $botq = 'What is 6 + 6?';

          $bota = '12';

       break;

    case 11:

    $botq = 'What is 5 x 3?';

          $bota = '15';

       break;

    case 12:

    $botq = 'What is 16 + 2?';

          $bota = '18';

       break;

    case 13:

    $botq = 'What is 20 + 25?';

          $bota = '45';

       break;

    case 14:

    $botq = 'What is 16 + 4?';

          $bota = '20';

       break;

    case 15:

    $botq = 'What is 9 + 1?';

          $bota = '10';

       break;

    case 16:

    $botq = 'What is 7 x 3?';

          $bota = '21';

       break;

    case 17:

    $botq = 'What is 7 + 7 + 1?';

          $bota = '15';

       break;

    case 18:

    $botq = 'What is 13 + 3?';

          $bota = '16';

       break;

    case 19:

    $botq = 'What color is a banana?';

          $bota = 'yellow';

       break;

    case 20:

    $botq = 'What is 15 - 5?';

          $bota = '10';

       break;

    case 21:

    $botq = 'Are you a bot?';

          $bota = 'no';

       break;

    case 22:

    $botq = 'Are you a cylon?';

          $bota = 'no';

       break;

    case 23:

    $botq = 'Are you from mars?';

          $bota = 'no';

       break;

    case 24:

    $botq = 'Is Earth a cube?';

          $bota = 'no';

       break;

    case 25:

    $botq = 'Can pigeons fly?';

          $bota = 'yes';

       break;

}

Ok, now to the form portion. make sure that your script has session_start() at the top of it and call this before your form starts:

PHP Code:

      require('path/to/whatever.php');

    $_SESSION['antibotcode'] = md5(strtolower($bota));

    session_write_close();

Now in your form, add this field, change teh style how you want and dump the paragragh tags if you want. If your form is not inside php tags, remove this ' . $botq . ' and replace it with <?php echo $botq; ?> . I hate design integrated with code, but to each his/her own, right?

HTML Code:

<p style="margin-top:0px;padding-top:0;"><span style="color:red;">* Human verification: </span><strong>' . $botq . '</strong><br style="height:35px;" /><input type="text" name="b" /></p>

Ok finally, in the script that you parse the form, you want to do this:

PHP Code:

      if (!empty($_POST['b'])) {

        $b = md5(strtolower($_POST['b']));

    } else {

        echo 'Go back and fill out all fields! Pretty please?';

    }

    if (!empty($_SESSION['antibotcode'])) {

        if ( $b != $_SESSION['antibotcode'] ) {

            unset($_SESSION['antibotcode']);

            echo 'Code typed incorrectly. Go back.';

        }

    } else {

        echo 'Hmmm, how did you get here without the proper session being set?';

    }

    unset($_SESSION['antibotcode']);

                // all is good, continue parsing form!

This is just a sample, but it gives you the general idea and you can change it to your specific needs.

* I like this, because I can include some very funny questions to give my guests a giggle as they sign up.

.

CrackFeed.Com · 03-03-2010, 05:46 AM

Note that there are faster and more efficient ways to store the Q and A's. But this is just an example, but it works well.

qbert220 · 03-04-2010, 06:09 AM

Great stuff. Thanks for sharing.

You might want to lowercase the visitor's answer before md5ing it to avoid rejecting someone typing "Yes", when you expected "yes".

I personally hate the ones that ask you to complete a word (I find this hard for some reason - I guess just the way my brain is wired). Also some questions are aimed at a particular culture or language variant. This is one I get asked quite often at one forum (it obviously has a limited set of questions):
????: NamePros.com http://www.namepros.com/showthread.php?t=642705

Quote:

Finish this word, these fly through the sky, airp????

The correct answer (for me) is aeroplanes, which obviously doesn't work.

I'd probably use arrays for storing Q's and A's.

CrackFeed.Com · 03-05-2010, 05:52 PM

Lol, I just first ran into one of those today at the cPanel boards. I hated it! lol

Thanks for pointing that out, changed

Ik · 03-13-2010, 02:16 PM

You know what! I hate it when the font is unreadable ;-( sometimes I try 3-4 times to get it right :-(

I'm with math. Thanks for the code.

CrackFeed.Com · 03-13-2010, 05:31 PM

Tell me about it, I retried a captcha 7 times earlier. lol

You are quite welcome!

intheflow · 03-14-2010, 01:41 PM

Nice code, thanks for sharing.

Just what I need for my contact form.

CrackFeed.Com · 03-16-2010, 07:27 PM

Thanks and you are welcome

**Eric** · 03-16-2010, 08:20 PM

I changed 'whatever.php' to the below. I dunno, that switch just made me cringe (not that all these arrays are that much better, but meh

)

PHP Code:

  <?php

 
$questions   = array();

$questions[] = array('q' => 'What is 5 + 3?',             'a' => '8');

$questions[] = array('q' => 'What is 3 + 2?',             'a' => '5');

$questions[] = array('q' => 'What is 5 + 5?',             'a' => '10');

$questions[] = array('q' => 'What is 2 + 7?',             'a' => '9');

$questions[] = array('q' => 'What color is a lemon?',     'a' => 'yellow');

$questions[] = array('q' => 'What is 5 + 1?',             'a' => '6');

$questions[] = array('q' => 'What is 7 + 7?',             'a' => '14');

$questions[] = array('q' => 'What is 8 + 8?',             'a' => '16');

$questions[] = array('q' => 'What shape has no corners?', 'a' => 'circle');

$questions[] = array('q' => 'What is 6 + 6?',             'a' => '12');

$questions[] = array('q' => 'What is 5 x 3?',             'a' => '15');

$questions[] = array('q' => 'What is 16 + 2?',            'a' => '18');

$questions[] = array('q' => 'What is 20 + 25?',           'a' => '45');

$questions[] = array('q' => 'What is 16 + 4?',            'a' => '20');

$questions[] = array('q' => 'What is 9 + 1?',             'a' => '10');

????: NamePros.com http://www.namepros.com/showthread.php?t=642705
$questions[] = array('q' => 'What is 7 x 3?',             'a' => '21');

$questions[] = array('q' => 'What is 7 + 7 + 1?',         'a' => '15');

$questions[] = array('q' => 'What is 13 + 3?',            'a' => '16');

$questions[] = array('q' => 'What color is a banana?',    'a' => 'yellow');

$questions[] = array('q' => 'What is 15 - 5?',            'a' => '10');

$questions[] = array('q' => 'Are you a bot?',             'a' => 'no');

$questions[] = array('q' => 'Are you a cylon?',           'a' => 'no');

$questions[] = array('q' => 'Are you from mars?',         'a' => 'no');

$questions[] = array('q' => 'Is Earth a cube?',           'a' => 'no');

$questions[] = array('q' => 'Can pigeons fly?',           'a' => 'yes');

 
$randnum = array_rand($questions);

 
$botq = $questions[$randnum]['q'];

$bota = $questions[$randnum]['a'];

????: NamePros.com http://www.namepros.com/showthread.php?t=642705
 
?>

CrackFeed.Com · 03-17-2010, 03:11 PM

Unless I am mistaken, that will use more resources from having to read all of that, where-as in a switch, it ignores the statements unless the key is matched.

**Eric** · 03-17-2010, 04:19 PM

Originally Posted by PHPGURU

Unless I am mistaken, that will use more resources from having to read all of that, where-as in a switch, it ignores the statements unless the key is matched.

Not necessarily. As more cases are added, the switch would become slower at executing than the array's. For this particular situation, the difference in speed of execution is negligible.
????: NamePros.com http://www.namepros.com/showthread.php?t=642705

My main reason for doing it the way I did, is readability. I think using the array's instead of giant switch statement is much more readable. JMO

CrackFeed.Com · 03-17-2010, 04:30 PM

Yeah, is pretty much up to personal pref unless you add a lot more.

Nodws · 04-09-2010, 12:16 AM

much better to say

Code:

$n1=rand(0,9);
$n2=rand(0,9);
$result=$n1+$n2+1; //we add 1, or any
$question="what is $n1 + $n2?";

//we echo the form and hide the result
echo"<form method=post>$question <input name=question><input type=hidden name=result value=$result></form>";

//we validate and subtract 1
if(($_POST[result]-1)===$_POST[question])
{
echo"you are human!"; //hurray, no switch()
}

simple as that

IsaacTacken · 04-09-2010, 02:45 PM

Thanks. I will use this instead of a captcha from now on.

Is there any problem if I replace the questions with my own? Or it doesn't matter to you?

CrackFeed.Com · 05-03-2010, 06:58 PM

Nah, change it to fit your needs

03-02-2010, 06:55 PM	THREAD STARTER #1 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Simple human verification code. I hate captcha and I am sure you do to. Here is an alternative that is abit more fun, to me at least. Put this into a file named whatever.php: PHP Code: $randnum = mt_rand(1,25); switch($randnum) { case 1: $botq = 'What is 5 + 3?'; $bota = '8'; break; case 2: $botq = 'What is 3 + 2?'; $bota = '5'; break; case 3: ????: NamePros.com http://www.namepros.com/code/642705-simple-human-verification-code.html $botq = 'What is 5 + 5?'; $bota = '10'; ????: NamePros.com http://www.namepros.com/showthread.php?t=642705 break; case 4: $botq = 'What is 2 + 7?'; $bota = '9'; break; case 5: $botq = 'What color is a lemon?'; $bota = 'yellow'; break; case 6: $botq = 'What is 5 + 1?'; $bota = '6'; break; case 7: $botq = 'What is 7 + 7?'; $bota = '14'; break; case 8: $botq = 'What is 8 + 8?'; $bota = '16'; break; case 9: $botq = 'What shape has no corners?'; $bota = 'circle'; break; case 10: $botq = 'What is 6 + 6?'; $bota = '12'; break; case 11: $botq = 'What is 5 x 3?'; $bota = '15'; break; case 12: $botq = 'What is 16 + 2?'; $bota = '18'; break; case 13: $botq = 'What is 20 + 25?'; $bota = '45'; break; case 14: $botq = 'What is 16 + 4?'; $bota = '20'; break; case 15: $botq = 'What is 9 + 1?'; $bota = '10'; break; case 16: $botq = 'What is 7 x 3?'; $bota = '21'; break; case 17: $botq = 'What is 7 + 7 + 1?'; $bota = '15'; break; case 18: $botq = 'What is 13 + 3?'; $bota = '16'; break; case 19: $botq = 'What color is a banana?'; $bota = 'yellow'; break; case 20: $botq = 'What is 15 - 5?'; $bota = '10'; break; case 21: $botq = 'Are you a bot?'; $bota = 'no'; break; case 22: $botq = 'Are you a cylon?'; $bota = 'no'; break; case 23: $botq = 'Are you from mars?'; $bota = 'no'; break; case 24: $botq = 'Is Earth a cube?'; $bota = 'no'; break; case 25: $botq = 'Can pigeons fly?'; $bota = 'yes'; break; } Ok, now to the form portion. make sure that your script has session_start() at the top of it and call this before your form starts: PHP Code: `require('path/to/whatever.php'); $_SESSION['antibotcode'] = md5(strtolower($bota)); session_write_close();` Now in your form, add this field, change teh style how you want and dump the paragragh tags if you want. If your form is not inside php tags, remove this ' . $botq . ' and replace it with <?php echo $botq; ?> . I hate design integrated with code, but to each his/her own, right? HTML Code: <p style="margin-top:0px;padding-top:0;"><span style="color:red;">* Human verification: </span><strong>' . $botq . '</strong><br style="height:35px;" /><input type="text" name="b" /></p> Ok finally, in the script that you parse the form, you want to do this: PHP Code: if (!empty($_POST['b'])) { $b = md5(strtolower($_POST['b'])); } else { echo 'Go back and fill out all fields! Pretty please?'; } if (!empty($_SESSION['antibotcode'])) { if ( $b != $_SESSION['antibotcode'] ) { unset($_SESSION['antibotcode']); echo 'Code typed incorrectly. Go back.'; } } else { echo 'Hmmm, how did you get here without the proper session being set?'; } unset($_SESSION['antibotcode']); // all is good, continue parsing form! This is just a sample, but it gives you the general idea and you can change it to your specific needs. * I like this, because I can include some very funny questions to give my guests a giggle as they sign up. . Last edited by CrackFeed.Com; 03-05-2010 at 05:53 PM.

03-14-2010, 01:41 PM	#7 (permalink)
intheflow NamePros Member Join Date: Sep 2008 Posts: 109	Nice code, thanks for sharing. Just what I need for my contact form. __________________ Asian dating \| asian love \| Luxury hotels Bangkok \| Airport hotels Bangkok

04-09-2010, 12:16 AM	#13 (permalink)
Nodws Senior Member Join Date: Jun 2008 Location: nodws.com Posts: 1,666 Follow @nodws	much better to say Code: $n1=rand(0,9); $n2=rand(0,9); $result=$n1+$n2+1; //we add 1, or any $question="what is $n1 + $n2?"; //we echo the form and hide the result echo"<form method=post>$question <input name=question><input type=hidden name=result value=$result></form>"; //we validate and subtract 1 if(($_POST[result]-1)===$_POST[question]) { echo"you are human!"; //hurray, no switch() } simple as that __________________ SnackNames.com \| SnackDesign.com \| buckstabu.com \| adoolt.com \| yoAmoNY.com Developer For Hire! PHP/MySQL/Wordpress/Etc Graphic design, Corporate ID, Dev Ideas Last edited by Nodws; 04-09-2010 at 12:20 AM.

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03-03-2010, 05:46 AM	THREAD STARTER #2 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Note that there are faster and more efficient ways to store the Q and A's. But this is just an example, but it works well.

03-05-2010, 05:52 PM	THREAD STARTER #4 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Lol, I just first ran into one of those today at the cPanel boards. I hated it! lol Thanks for pointing that out, changed

03-13-2010, 02:16 PM	#5 (permalink)
Ik Quality // Join Date: Sep 2008 Posts: 911	You know what! I hate it when the font is unreadable ;-( sometimes I try 3-4 times to get it right :-( I'm with math. Thanks for the code.

03-13-2010, 05:31 PM	THREAD STARTER #6 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Tell me about it, I retried a captcha 7 times earlier. lol You are quite welcome!

03-16-2010, 07:27 PM	THREAD STARTER #8 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Thanks and you are welcome

03-16-2010, 08:20 PM	#9 (permalink)
Eric Tech Support Join Date: Mar 2005 Posts: 4,944	I changed 'whatever.php' to the below. I dunno, that switch just made me cringe (not that all these arrays are that much better, but meh ) PHP Code: <?php $questions = array(); $questions[] = array('q' => 'What is 5 + 3?', 'a' => '8'); $questions[] = array('q' => 'What is 3 + 2?', 'a' => '5'); $questions[] = array('q' => 'What is 5 + 5?', 'a' => '10'); $questions[] = array('q' => 'What is 2 + 7?', 'a' => '9'); $questions[] = array('q' => 'What color is a lemon?', 'a' => 'yellow'); $questions[] = array('q' => 'What is 5 + 1?', 'a' => '6'); $questions[] = array('q' => 'What is 7 + 7?', 'a' => '14'); $questions[] = array('q' => 'What is 8 + 8?', 'a' => '16'); $questions[] = array('q' => 'What shape has no corners?', 'a' => 'circle'); $questions[] = array('q' => 'What is 6 + 6?', 'a' => '12'); $questions[] = array('q' => 'What is 5 x 3?', 'a' => '15'); $questions[] = array('q' => 'What is 16 + 2?', 'a' => '18'); $questions[] = array('q' => 'What is 20 + 25?', 'a' => '45'); $questions[] = array('q' => 'What is 16 + 4?', 'a' => '20'); $questions[] = array('q' => 'What is 9 + 1?', 'a' => '10'); ????: NamePros.com http://www.namepros.com/showthread.php?t=642705 $questions[] = array('q' => 'What is 7 x 3?', 'a' => '21'); $questions[] = array('q' => 'What is 7 + 7 + 1?', 'a' => '15'); $questions[] = array('q' => 'What is 13 + 3?', 'a' => '16'); $questions[] = array('q' => 'What color is a banana?', 'a' => 'yellow'); $questions[] = array('q' => 'What is 15 - 5?', 'a' => '10'); $questions[] = array('q' => 'Are you a bot?', 'a' => 'no'); $questions[] = array('q' => 'Are you a cylon?', 'a' => 'no'); $questions[] = array('q' => 'Are you from mars?', 'a' => 'no'); $questions[] = array('q' => 'Is Earth a cube?', 'a' => 'no'); $questions[] = array('q' => 'Can pigeons fly?', 'a' => 'yes'); $randnum = array_rand($questions); $botq = $questions[$randnum]['q']; $bota = $questions[$randnum]['a']; ????: NamePros.com http://www.namepros.com/showthread.php?t=642705 ?>

03-17-2010, 03:11 PM	THREAD STARTER #10 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Unless I am mistaken, that will use more resources from having to read all of that, where-as in a switch, it ignores the statements unless the key is matched.

03-17-2010, 04:30 PM	THREAD STARTER #12 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Yeah, is pretty much up to personal pref unless you add a lot more.

04-09-2010, 02:45 PM	#14 (permalink)
IsaacTacken Account Suspended Join Date: Apr 2010 Posts: 13 Follow @WorldKaoss	Thanks. I will use this instead of a captcha from now on. Is there any problem if I replace the questions with my own? Or it doesn't matter to you?

05-03-2010, 06:58 PM	THREAD STARTER #15 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	Nah, change it to fit your needs

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