protecting against scripts

[queball]

I remember seeing a site which contained ready to use code to generate, for example, images with obscured numbers like you might see when registering for Yahoo Games or E-Gold. These are used to verify that the account is being registered by a human. Despite much googling I can't find this site again, so I wonder if any of you know where I could find code like this, or any synonyms for these systems.

i'm sure there was a chanllenge or something on these boards a while back that related to this

[MT]

<?php
    function getmicrotime(){ 
        list($usec, $sec) = explode(" ",microtime()); 
        return ((float)$usec + (float)$sec); 
    } 
    $start = getmicrotime();
    Header("Content-type: image/jpeg");
    function makeKey() {
        //32 - 126
        $tArr = array();
        while(sizeof($tArr)<8) {
            $tArr[] = chr(mt_rand(65,90));
        }
        return $tArr;
    }
    //generate 7 letter passkey
    $passkey = makeKey();
    //generate list of available fonts
    $basedir='/usr/fonts';
    $arFonts = array();
    if ($dHandle = opendir($basedir)) {
        while ($tFName = readdir($dHandle)) {
            if (eregi("ttf$",$tFName)) {
                $arFonts[] = $basedir . '/' . $tFName;
            }
        }
    }
    $fonts = sizeof($arFonts);
    if ($fonts==0) {
        die("No fonts found!");
    }
    //choose a font attributes for each character
    $face = array();$fsize = array();$fangle = array();
    while(sizeof($face)<8) {
        $face[] = mt_rand(0,$fonts-1);
        $fsize[] = mt_rand(32,72);
        $fangle[] = mt_rand(0,10);
    }
    //work out dimensions
    $fp = fopen('used.txt','a');
    $dx = 0; $dy = 0;$dpad = 12;
    foreach($passkey as $val => $char) {
        $fnt = $face[$val];
        $size = imagettfbbox($fsize[$val],$fangle[$val],$arFonts[$fnt],$char);
        $dx += abs($size[2]-$size[0]) + $dpad;
        $ddy = abs($size[5]-$size[3]);
        $ddy += abs($dx * tan(deg2rad($fangle[$val])));
        $dy = max($ddy,$dy);
        fwrite($fp,"Character $char in ".$arFonts[$fnt]."\n");
    }
    
    $xpad=90;
    $ypad=90;
    $im = imagecreate($dx+$xpad,$dy+$ypad);
    //$blue = ImageColorAllocate($im, 0x2c,0x6D,0xAF);
    $black = ImageColorAllocate($im, 215,215,215);
    $white = ImageColorAllocate($im, 230,230,230);
    ImageRectangle($im,0,0,$dx+$xpad-1,$dy+$ypad-1,$black);
    ImageRectangle($im,0,0,$dx+$xpad,$dy+$ypad,$white);
    $currx = (int)($xpad/2); $curry = (int)($ypad/2);
    foreach($passkey as $val => $char) {
        $fnt = $face[$val];
        $size = imagettfbbox($fsize[$val],$fangle[$val],$arFonts[$fnt],$char);
        $thisx = abs($size[2]-$size[0]) + $dpad;
        //$thisy = abs($size[5]-$size[3]) + abs($dx * tan(deg2rad($fangle[$val])));
        ImageTTFText(   $im,
                        $fsize[$val],
                        $fangle[$val],
                        $currx+1,
                        (int)($ypad/2)+$dy,
                        $black,
                        $arFonts[$fnt],
                        $char);
        ImageTTFText(   $im,
                        $fsize[$val],
                        $fangle[$val],
                        $currx,
                        (int)($ypad/2)-1+$dy,
                        $white,
                        $arFonts[$fnt],
                        $char);
        $currx += $thisx;
    }
    $x=0;$y=0;$mx=imagesx($im);$my=imagesy($im);$sx=0;
    while($y < $my) {
        while ($x < $mx) {
            imagesetpixel($im,$x,$y,$white);
            $x+=2;
        }
        $y++;
        if ($sx) {
           $x=0;$sx=0;
        }
        else {
           $x=1;$sx=1;
       }
    }    
    imagegammacorrect($im, 20.0, 1.0);
    Imagejpeg($im,'',50);
    ImageDestroy($im);
    $timestr = strftime("%T %D");
    $userinfo = "$HTTP_USER_AGENT @ ".$_SERVER["REMOTE_ADDR"]."\n$timestr";
    $ttime = number_format(getmicrotime() - $start,4);
    fwrite($fp,"$userinfo generated in $ttime seconds\n\n");fclose($fp);
?>

[queball]

OK, I need one that makes an audio file for blind users, ta.

[queball]

http://www.captcha.net/

yay
\o/