|
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);
?>
|
|
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