Thread: GumCha simple captcha, no mysql no sessions, flatfile captch

here is a captcha code which i have developed for wap sites.

1. create a new file image.php and put the next code code to it:

PHP Code:

<?php

@exec("find ./gumcha/ -maxdepth 1 -type f -mtime +1 -exec rm -f {} \;");


$code = rand_string(5);
file_put_contents('./gumcha/'.$code, $code);


function rand_string( $length ) {
    $chars = "abcdefghijklmnopqrstuvwxyz123456789";    

    $size = strlen( $chars );
    for( $i = 0; $i < $length; $i++ ) {
        $str .= $chars[ rand( 0, $size - 1 ) ];
    }

    return $str;
}


/* YOU CAN MODIFY THE IMAGE CODE FROM HERE TO CREATE MORE COOL CAPTCHA IMAGES, eg. with different backgrounds */
header("Content-type: image/gif");
$im = @imagecreate(60, 25)
    or die("Cannot Initialize new GD image stream");
$background_color = imagecolorallocate($im, 0, 0, 0);
$text_color = imagecolorallocate($im, 233, 14, 91);
imagestring($im, 3, 5, 5,  $code, $text_color);
imagegif($im);
imagedestroy($im);

?>

create folder gumcha where the captcha image script is and chmod 777 it.


and then use this peace of code which will check if the gumcha generated code is correct:

PHP Code:

if($_POST){
            $gumcha_code = $_POST['code'];

    if(gumcha_check($gumcha_code) == true)
    {


                       // HERE GOES THE CONTENT AFTER THE CAPTCHA VALIDATION


    }else echo 'WRONG CAPTCHA CODE';
}

function gumcha_check($code)
{
    $code = trim($code);
    $code = str_replace('.','',$code);
    $code = strtolower($code);
    if (preg_match("/[^\da-z]+/", $code)) return false;
    elseif(strlen($code)<2)return false;
    elseif(file_exists('./gumcha/'.$code))
    {
        @unlink('./gumcha/'.$code);
        return true;
    }
    else return false;
} 


You don't need tut if u use head or common sense..Be wise..Trust urself u can do it with ur own and learn with urself..If not, you don't deserve to be a good coder..