Avoid Spam In Message Board

[cmarangon]

How can I protecrt my Message Board from spammers?

Is the 5 digits capcha sufficient?

The one in your site:

http://www.phpjunkyard.com/mboard/mboard.php

Seems not be atqacked by spammers.

How can I protect my message board?

Sincerely,

Carlos

[Klemen]

The mboard is indeed due to an update, but as a temporary solution you can try this trick:

1. open file "secimg.inc.php" in Notepad
2. Change this code

Code: Select all

$text_color = imagecolorallocate($im, 0, 0, 0);

to

Code: Select all

$text_color = imagecolorallocate($im, 255, 0, 0);

3. save, upload to the server and test

[cmarangon]

Sure, but what this will do?
Change the capcha color to red?

[Klemen]

Exactly - I know that sounds too simple, but it seems to do the trick for now, because the spam bots have learned to read black text on white background.

[cmarangon]

And if we can make it a random color?

$RGB1 = rand (1,255);
$text_color = imagecolorallocate($im, $RGB1, 0, 0);


$RGB1 = rand (1,255);
will generate a random number between 1 and 255, this exlcude black, because it will exclude "0" from the random variable. It will return a red color or other similar to it.

Maybe this other, can generate a color RGB for captcha:

$RGB1 = rand (1,255);
$RGB3 = rand (1,255);
$RGB3 = rand (1,255);
$text_color = imagecolorallocate($im, $RGB1, $RGB2, $RGB3);


What do you think about?

[Klemen]

Sure, but you may want to limit the upper value to say 125 instead of 255 or you might get very light text on white background ( = hard to read).