Hey guys, I would have posted this in the other thread I started today, but this has enough of a difference that I think it warrants a new thread. I have new/different code anyway...
So here's the deal: I'm trying to generate an image visual confirmation to prevent spam bots from registering - in short, trying to get a captcha working.
On submit, I keep getting the error that I was "unsuccessful" even if I type in the correct code... see this line in register.php:
echo 'You were unsuccessful';
Any idea why?
Here's my code for register.php:
This is in CaptchaSecurityImages.php...
Thanks,
David
So here's the deal: I'm trying to generate an image visual confirmation to prevent spam bots from registering - in short, trying to get a captcha working.
On submit, I keep getting the error that I was "unsuccessful" even if I type in the correct code... see this line in register.php:
echo 'You were unsuccessful';
Any idea why?
Here's my code for register.php:
PHP:
<?php
session_start();
$posted = isset($_GET['submitted']) ? $_GET['submitted'] : "";
if ($posted == 'submitted')
{
if(($_SESSION['security_code'] == $_POST['security_code']) && (!empty($_SESSION['security_code'])) ) {
// Insert you code for processing the form here
echo 'You were successful!';
}
else {
echo 'You were unsuccessful';
// Insert your code for showing an error message here
}
}
?>
<html>
<head>
<title>Students in Action Registration</title>
</head>
<body bgcolor="#FFFFFF">
<form method="get" action="register.php">
<input type="hidden" name="submitted" value="submitted">
<img src="CaptchaSecurityImages.php" />
Security Code:
<input id="security_code" name="security_code" type="text" />
<input type="submit" value="Submit Registration">
</form>
</body>
</html>This is in CaptchaSecurityImages.php...
PHP:
<?php
session_start();
// a bunch of GNU copyright info, removed to save space
class CaptchaSecurityImages {
function generateCode($length) {
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$i = 0;
while ($i < $length) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
return $code;
}
function CaptchaSecurityImages($width,$height,$characters,$font_size) {
$code = $this->generateCode($characters);
$im = imagecreate($width, $height) or die('Cannot Initialize new GD image stream');
$background_color = imagecolorallocate($im, 255, 255, 255);
$dot_color = imagecolorallocate($im, 35, 75, 170);
$text_color = imagecolorallocate($im, 20, 45, 120);
for($i=0;$i<($width*$height)/4;$i++) {
imagefilledellipse($im,mt_rand(0,$width),mt_rand(0,$height),1,1,$dot_color);
}
$padding_left = ($width-($font_size/1.3*$characters))/2;
$padding_top = ($height-$font_size)/2+$font_size;
imagettftext($im, $font_size, 0, $padding_left, $padding_top, $text_color, '/usr/share/fonts/truetype/freefont/FreeSerif.ttf', $code);
imagepng($im);
imagedestroy($im);
$_SESSION['security_code'] = $code;
}
}
$width = $_GET['width'] ? $_GET['width'] : '80';
$height = $_GET['height'] ? $_GET['height'] : '40';
$characters = $_GET['characters'] ? $_GET['characters'] : '6';
$font_size = $_GET['font_size'] ? $_GET['font_size'] : '15';
header('Content-Type: image/png');
$captcha = new CaptchaSecurityImages($width,$height,$characters,$font_size);
?>Thanks,
David
