PHP Captcha Problem

Hi,

I am new to php coding and I make a captcha by downloading code from net. But I have a problem during checking of captcha. I have used this code for making captcha image.

<?php
session_start();

class CaptchaSecurityImages {

var $font = 'monofont.ttf';

function generateCode($characters) {
/* list all possible characters, similar looking characters and vowels have been removed */
$possible = '23456789bcdfghjkmnpqrstvwxyz';
$code = '';
$i = 0;
while ($i < $characters) {
$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
$i++;
}
return $code;
}

function CaptchaSecurityImages($width='120',$height='40',$characters='6') {
$code = $this->generateCode($characters);
/* font size will be 75% of the image height */
$font_size = $height * 0.75;
$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
/* set the colours */
$background_color = imagecolorallocate($image, 255, 255, 255);
$text_color = imagecolorallocate($image, 20, 40, 100);
$noise_color = imagecolorallocate($image, 100, 120, 180);
/* generate random dots in background */
for( $i=0; $i<($width*$height)/3; $i++ ) {
imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
}
/* generate random lines in background */
for( $i=0; $i<($width*$height)/150; $i++ ) {
imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
}
/* create textbox and add text */
$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
$x = ($width - $textbox[4])/2;
$y = ($height - $textbox[5])/2;
imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
/* output captcha image to browser */
header('Content-Type: image/jpeg');
imagejpeg($image);
imagedestroy($image);
$_SESSION['security_code'] = $code;
}

}

$width = isset($_GET['width']) ? $_GET['width'] : '120';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';

$captcha = new CaptchaSecurityImages($width,$height,$characters);

?>

After that in form page I have sourcing this page as a image.

In same page I have also done coding for captcha checking. Code is shown below

<?php
session_start();

if(isset($_REQUEST['Submit'])){

$name = stripslashes($_POST['Name']);
$email = stripslashes($_POST['Email']);
$phone = stripslashes($_POST['Phone']);
$fax = stripslashes($_POST['Fax']);
$msgbody = stripslashes($_POST['Remarks']);

if (isset($_SESSION['security_code'])) {
$key=$_SESSION['security_code'];
}

$number = stripslashes($_POST['number']);

echo "key: $key";
echo "number: $number";

if($number==$key)
{

error_reporting(0);
$recipient = 'test@test.com';
$change = str_replace("\r\n", " ", $msgbody);

$subject ="Testing";

$message =" <table width='95%' border='0' cellpadding='0' cellspacing='0' > <tr><td valign='top'>Dear Web Administrator, One of the Visitors at <a href='http://www.agrasys.net' target='_blank'>www.agrasys.net</a> has contacted you with the following details - <table width='500' border='1' cellpadding='2' cellspacing='0' bordercolor='#FFFFFF'>";
$message.="<tr> <td width='20%' bgcolor='#ececfc'>Name</td><td width='80%' >$name</td></tr><tr> <td width='20%' bgcolor='#ececfc'>Phone</td><td width='80%' >$phone</td></tr><tr> <td width='20%' bgcolor='#ececfc'>Fax</td><td width='80%' >$fax</td></tr><tr><td width='20%' bgcolor='#ececfc'>E-mail</td><td width='80%' ><a href='mailto:$email'>$email</a></td></tr><tr><td width='20%' valign='top' bgcolor='#ececfc'>Remarks</td><td width='80%' >$change</td></tr>";
$message.="</table> Best Regards, <a href='http://www.agrasys.net'>www.agrasys.net</a> </td></tr></table>";

$headers = "MIME-Version: 1.0\r\n";
$headers.= "Content-type: text/html; charset=iso-8859-1\r\n";
$headers.= "From: $email\r\n";

mail($recipient, $subject, $message, $headers);

}
}
?>

I print the key and number which is marked as bold above, it doesn't match though I have filled the correct captcha image value in text field in form.

Sometimes it match with captcha value sometime not.

Plz help me to solve this problem.

Thanks in advance.

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PHP Captcha Problem

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daman371 Peon

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PHP Captcha Problem

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daman371 Peon

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