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Captcha Code

Das ist der Beispiel Code für eine Captcha Abfrage.

Script:

<?php /*
example of usage:

inside your form
<input type="text" name="validator" id="validator" size="4" />
<img src="random.php" alt="CAPTCHA image" width="60" height="20" vspace="1" align="top" />

and test the value of the "validator" form field like:
if (!empty($_POST['validator']) && $_POST['validator'] == $_SESSION['rand_code']) {
    process your form here
    at least destroy the session
    unset($_SESSION['rand_code']);
*/

// save this code in your random script
session_start();

if (empty(
$_SESSION['rand_code'])) {
    
$str = "";
    
$length = 0;
    for (
$i = 0; $i < 4; $i++) {
        
// this numbers refer to numbers of the ascii table (small-caps)
        
$str .= chr(rand(97, 122));
    }
    
$_SESSION['rand_code'] = $str;
}

$imgX = 60;
$imgY = 20;
$image = imagecreatetruecolor(60, 20);

$backgr_col = imagecolorallocate($image, 238,239,239);
$border_col = imagecolorallocate($image, 208,208,208);
$text_col = imagecolorallocate($image, 46,60,31);

imagefilledrectangle($image, 0, 0, 60, 20, $backgr_col);
imagerectangle($image, 0, 0, 59, 19, $border_col);

$font = "VeraSe.ttf";
$font_size = 10;
$angle = 0;
$box = imagettfbbox($font_size, $angle, $font, $_SESSION['rand_code']);
$x = (int)($imgX - $box[4]) / 2;
$y = (int)($imgY - $box[5]) / 2;
imagettftext($image, $font_size, $angle, $x, $y, $text_col, $font, $_SESSION['rand_code']);

header("Content-type: image/png");
imagepng($image);
imagedestroy ($image);
?>

 
ID: 999
eingestellt am: 09.06.2006
Autor: NA
Status zum lesen: Gast
gelesen: 9012
Webseite: www.dreamcodes.com
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