Captcha

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ramsfield
Forum Newbie
Posts: 6
Joined: Mon Sep 22, 2003 2:24 pm

Captcha

Post by ramsfield »

I am trying to use the catpcha provided by: http://www.white-hat-web-design.co.uk/a ... aptcha.php

When I visit form.php, it loads, but the image is unavailable (square with red x), hence i can not see the captcha characters.

I have checked and I do have GD and Freetype installed with PHP

I have a simple page, located in the root of the site, which contains:

--form.php

Code: Select all

 
    <form action="form.php" method="post">
<img src="CaptchaSecurityImages.php" />
Security Code: 
<input id="security_code" name="security_code" type="text" />
    </form>
 
--CaptchaSecurityImages.php

Code: Select all

 
<?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['height'] < 600 ? $_GET['width'] : '120';
$height = isset($_GET['height']) && $_GET['height'] < 200 ? $_GET['height'] : '40';
$characters = isset($_GET['characters']) && $_GET['characters'] > 2 ? $_GET['characters'] : '6';
 
$captcha = new CaptchaSecurityImages($width,$height,$characters);
 
?>
 
 
User avatar
jimthunderbird
Forum Contributor
Posts: 147
Joined: Tue Jul 04, 2006 3:59 am
Location: San Francisco, CA

Re: Captcha

Post by jimthunderbird »

I guess you are missing the font "monofont.ttf" in the same directory. You code works fine, I upload arial.ttf on my website and test it works :D
ramsfield
Forum Newbie
Posts: 6
Joined: Mon Sep 22, 2003 2:24 pm

Re: Captcha

Post by ramsfield »

I forgot to mention, but yes that font is on the server in the root of the site with the other two pages.
User avatar
jimthunderbird
Forum Contributor
Posts: 147
Joined: Tue Jul 04, 2006 3:59 am
Location: San Francisco, CA

Re: Captcha

Post by jimthunderbird »

ramsfield wrote:I forgot to mention, but yes that font is on the server in the root of the site with the other two pages.
Ok, I guess the "include_path" in your php.ini is something else. So in CaptchaSecurityImages.php, after

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   session_start();
 
add

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  ini_set("include_path","."); 
 
It should work then.
ramsfield
Forum Newbie
Posts: 6
Joined: Mon Sep 22, 2003 2:24 pm

Re: Captcha

Post by ramsfield »

Nope, still no luck.

I will try reinstalling PHP tomorrow...
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