how to verify the code?

[nightcats]

Hi,

I try to put a very basic Capcha system in my forum. I've already
figure out how to randonly generate a combination:

<?
function Pass($i=8) {
srand((double)microtime()*1000000);
return strtoupper(substr(md5(uniqid(rand())),rand(0,32-$i),
$i));
}
echo Pass(4)."<br>";
echo;
?>

======

But I don't know how to generate an text area for my visitors to input
the code, and verify the value with the combination.

Can anyone help me to finish the rest of the verification process?
Thanks thanks thanks thanks a million.

[ptdorf]

But I don't know how to generate an text area for my visitors to input

the code, and verify the value with the combination.

Can anyone help me to finish the rest of the verification process?
Thanks thanks thanks thanks a million.

You need an image to generate the Captcha random letters, store that
generated string in the $_SESSION super globals ($_SESSION['Captcha']
or something like this) and then, check the input from the form
against the $_SESSION.

The image with the random captcha text can be created with php built-
in function to manip images. Then on your form, you just need to add
the captcha image something like: <img src="captcha.php" /and that
captcha.php file should generate the image and set the text in the
session.

At least, thats my way...

[nightcats]

On 9 16 , 9 31 , [e-mail] wrote:

But I don't know how to generate an text area for my visitors to input
the code, and verify the value with the combination.

Can anyone help me to finish the rest of the verification process?
Thanks thanks thanks thanks a million.

You need an image to generate the Captcha random letters, store that
generated string in the $_SESSION super globals ($_SESSION['Captcha']
or something like this) and then, check the input from the form
against the $_SESSION.

The image with the random captcha text can be created with php built-
in function to manip images. Then on your form, you just need to add
the captcha image something like: <img src="captcha.php" /and that
captcha.php file should generate the image and set the text in the
session.

At least, thats my way...

thanks for replying.

well......I really don't need to go that far. I think for now a random
text is enough.

Now I can make my webpage generates a random combination. All I need
next is to creat a text area to compare with the randon code
generated, as what I said in my first article.

Can anybody help me with the rest part of the verifying process?
thanks.

[ptdorf]

Now I can make my webpage generates a random combination. All I need

next is to creat a text area to compare with the randon code
generated, as what I said in my first article.

something like this:

<!-- create the form -->

<form method="POST">
Please, write down the following code: <?php
$code = Pass(4);
$_SESSION['Captcha'] = $code;
echo $code; ?>
<input type="text" name="code" />
<input type="submit" />
</form>

<!-- check the code -->
<?php

$valid = 0;
if (isset($_POST['code'])) {
if (isset($_SESSION['code'])) {
$valid = $_POST['code'] == $_SESSION['code'];
}
}
echo 'The code is ', ($valid ? 'valid' : 'invalid');
?>

[ptdorf]

Sorry, not:

$_SESSION['Captcha'] = $code;

But:

$_SESSION['code'] = $code;

[nightcats]

On 9 16 , 10 32 , [e-mail] wrote:

Sorry, not:

$_SESSION['Captcha'] = $code;

But:

$_SESSION['code'] = $code;- -

- -

Hi

I just want to say "thank you".

with your help, I made a little adustment myself. I've got it all
figured out.

Thanks again. :)