Captcha Images, how to make captacha image?

[mohsin_ansari]

i am trying to make captcha image for my registration account
heres the code

<?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 = '123456789bcdfghjkmnpqrstvwxyz';
$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);
$_SESSION['security_code'] = $code;
/* 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 , $code) or die('Error in imagettftext function');
/* output captcha image to browser */
imagejpeg($image);
imagedestroy($image);

}

}

$width = isset($_GET['width']) ? $_GET['width'] : '220';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) ? $_GET['characters'] : '8';

header('Content-Type: image/jpeg');
$captcha = new CaptchaSecurityImages($width,$height,$characters);

?>
but the following error is coming
<br />
<b>Fatal error</b>: Call to undefined function imageTTFBbox() in /finall/users/CaptchaSecurityImages.php</b> on line <b>38</b><br />

i dont understand why this fuction is undefined!! am using php5 !

[Andrew]

Quote from php.net

Note: This function requires both the GD library and the » FreeType library.

I don't know if FreeType is installed on Zymic servers.

[mohsin_ansari]

any alernatives???

[Andrew]

Quick google search returned this
http://www.codewalkers.com/c/a/Miscellaneo...PTCHA-with-PHP/

It uses part of a randomly generated md5 string. Doesn't use any font of your own. Although this may not be what you wanted, it should work. I haven't tested it on Zymic servers, but looking over the code pretty quick seems like it should.

[mohsin_ansari]

thanks buddy for the qucik search now i just changed my code like that


<?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 = '123456789bcdfghjkmnpqrstvwxyz';
$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);
$_SESSION['security_code'] = $code;
/* 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, 0, 0, 0);
$text_color = imagecolorallocate($image,233,239,239);
$noise_color = imagecolorallocate($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);
}
hear i changed the code

imagestring($image,2,40,10,$code,$text_color);





imagejpeg($image);
imagedestroy($image);

}

}

$width = isset($_GET['width']) ? $_GET['width'] : '220';
$height = isset($_GET['height']) ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) ? $_GET['characters'] : '8';

header('Content-Type: image/jpeg');
$captcha = new CaptchaSecurityImages($width,$height,$characters);

?>


and works perfectly !!!!!!!!!!!!!!
happy endings
http://egraduate.vndv.com/finall/users/singin_employes.php

[Andrew]

Man that is one serious captcha. Thats the smallest letters i've ever seen, but I guess that could stop a robot from figuring it out.

Just so you know you spelled signin wrong. I don't think you meant singin. (in your url in case you don't realize what I'm talking about.

Also you spelled work, Wrok in Work Phone.

How Did You Hear about us: In Magazin should be In Magazine.

And Verification you spelled Varification.

I know you're still building the form, but I thought i'd just let you know.