Captcha

[razzbee]

ok here it is

add it ur register form page

$hider=rand(1000,100000);
<small><b>Enter This Code Below:*</b></small><br/>
<b>$hider</b><br/>
<input type=\"hidden\" name=\"scode\" value=\"$hider\"/>

and the post field

<postfield name=\"code\" value=\"$(code)\"/>

and post

$code=htmlspecialchars(stripslashes(trim($code)));
$scode=htmlspecialchars(stripslashes(trim($scode)));
$pcode=htmlspecialchars(stripslashes(trim($pcode)));

and the error msg

if(($code) != ($scode)) $error='Incorrect security code!<br/>Please Enter Correct Code Shown In Last Page<br/>';

njoy bro

Gumslone..Why are You confusing the guy if you dont want to teach him the how to do it best..I believe in teaching one how to fish so that he can fish and become better...anyway I still believe that code up there is a crap since bots can still read that thing cos before i create a bot I will have to check your html form input source code first,dont think the hidden attribute will save U ..Session I know is one of the best way to track captcha code both for mobile and pc,only that the session id is best in url for mobile that cookies(I never agreed with Gumslone that session is not the best)...

[GumSlone]

Gumslone..Why are You confusing the guy if you dont want to teach him the how to do it best..I believe in teaching one how to fish so that he can fish and become better...anyway I still believe that code up there is a crap since bots can still read that thing cos before i create a bot I will have to check your html form input source code first,dont think the hidden attribute will save U ..Session I know is one of the best way to track captcha code both for mobile and pc,only that the session id is best in url for mobile that cookies(I never agreed with Gumslone that session is not the best)...

first of all, there are several captcha scripts here in forums which he could find using the site search,
second, he wanted a text captcha so i gave him an example how he could do it and told that it was not very clever to use that type of captcha,
and last third thing, if you were an experienced wapmaster you would know that sessions/cookies are not the best way for captcha on mobile phone.

[subzero]

1) Make a PHP script (separate file captcha.php) which will generate the image:

<?php 
session_start(); 
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");  
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");  
header("Cache-Control: no-store, no-cache, must-revalidate");  
header("Cache-Control: post-check=0, pre-check=0", false); 
header("Pragma: no-cache");  

function _generateRandom($length=6) 
{ 
    $_rand_src = array( 
        array(48,57) //digits 
        , array(97,122) //lowercase chars 
//        , array(65,90) //uppercase chars 
    ); 
    srand ((double) microtime() * 1000000); 
    $random_string = ""; 
    for($i=0;$i<$length;$i++){ 
        $i1=rand(0,sizeof($_rand_src)-1); 
        $random_string .= chr(rand($_rand_src[$i1][0],$_rand_src[$i1][1])); 
    } 
    return $random_string; 
} 

$im = @imagecreatefromjpeg("captcha.jpg");  
$rand = _generateRandom(3); 
$_SESSION['captcha'] = $rand; 
ImageString($im, 5, 2, 2, $rand[0]." ".$rand[1]." ".$rand[2]." ", ImageColorAllocate ($im, 0, 0, 0)); 
$rand = _generateRandom(3); 
ImageString($im, 5, 2, 2, " ".$rand[0]." ".$rand[1]." ".$rand[2], ImageColorAllocate ($im, 255, 0, 0)); 
Header ('Content-type: image/jpeg'); 
imagejpeg($im,NULL,100); 
ImageDestroy($im); 
?>

2) Add the following line at the top of the page where you need to implement CAPTCHA:

<?php session_start() ?>

3) Add the following line to check whether the CAPTCHA string entered by the visitor is valid, before the line where you will proceed with a submitted message:

<?php 
if($_SESSION["captcha"]==$_POST["captcha"])
{
    //CAPTHCA is valid; proceed the message: save to database, send by e-mail ...
}
?>

4) Finaly add the CAPTCHA to the form:

<?php session_start() ?>
<form method="post" action="">
<table bgcolor="#CCCCCC">
<tr><th>Contact us (Post new message):</th></tr>
<tr><td><textarea cols="30" rows="5" name="message"></textarea></td></tr>
<tr><td align="center">CAPTCHA:<br>
    (antispam code, 3 black symbols)<br>
    <table><tr><td><img src="captcha.php" alt="captcha image"></td>
    <td><input type="text" name="captcha" size="3" maxlength="3"></td></tr></table>
</td></tr>
<tr><th align="center"><input type="submit" value="Submit"></th></tr>    
</table>
</form>
<?php
if(isset($_POST["captcha"]))
if($_SESSION["captcha"]==$_POST["captcha"])
{
    //CAPTHCA is valid; proceed the message: save to database, send by e-mail ...
    echo 'CAPTCHA is valid; proceed the message';
}
else
{
    echo 'CAPTCHA is not valid; ignore submission';
}
?>

[ASNirman]

@subzero can u give captcha.php on a zip file?

[metulj]

@subzero can u give captcha.php on a zip file?

subzero's entire post in TXT => ziped

[ASNirman]

subzero's entire post in TXT => ziped

Thanks...

[morse]

Gumslone..Why are You confusing the guy if you dont want to teach him the how to do it best..I believe in teaching one how to fish so that he can fish and become better...anyway I still believe that code up there is a crap since bots can still read that thing cos before i create a bot I will have to check your html form input source code first,dont think the hidden attribute will save U ..Session I know is one of the best way to track captcha code both for mobile and pc,only that the session id is best in url for mobile that cookies(I never agreed with Gumslone that session is not the best)...

I disagree, session is a very stupid thing to be done for mobile community sites. I ended up junking session system for pure cookie based authentication (this one sucks even more) but atleast it avoids all session expiry , session change problems.

[razzbee]

INSTRUCTIONS

I am sorry,I wrote the instruction with my mobile whiles in a bus...The captcha code is working perfectly

Demo : De $ Makers
The instruction is edited,errors removed,plz post back if U have other errors,again you can edit it to suit your
preferance

STEP 1

Extract the content to your root folder ,that is public_html or htdocs


STEP 2
Put the code below inbetween the <head> </head> of your registration page

CODE :

session_start();
----------------------------------------

STEP 3
add the code below to your form..your form must be with the extension name.php

CODE :

<div class='form-captcha'>Captcha<br>
<span align='left'><img src='captcha.php' alt='captcha' /></span>
</div><br>
<div>

<input type='text' name='captcha' placeholder='enter captcha' /> </div>
<div >
-------------------------------------------------------------------------
STEP 4
Put the code below inbetween the <head> </head> of your registration page

CODE :

session_start();


STEP 5

add this to the page that will proccess the registration form

CODE :

//getting the captcha security codes
$session_captcha=$_SESSION['captcha_code'];

$user_captcha=$_POST['captcha'];

//cleaning our captcha codes
$user_captcha=htmlentities($user_captcha);

if(!preg_match("/(^[a-zA-Z0-9]+)$/",$user_captcha)){


die("Captcha code is invalid");


}

//comaparing if the captcha codes matches
if(!strcmp($user_captcha,$session_captcha)=='0'){

die("The security code you entered is invalid");

}//end captcha check

The instruction is edited,errors removed,plz post back if U have other errors,again you can edit it to suit your
preferance

I am sorry,I wrote the instruction with my mobile whiles in a bus...The captcha code is working perfectly

Demo : De $ Makers

[arnage]

I don't know for the archive but posted instructions are full of errors.