CAPTCHA -

craigerjs · August 7, 2010

Hi, I am making a CAPTCHA image. I am pretty sure the code I have is correct, but I am getting these error messages when I run the script. I use GoDaddy for hosting. The font that I reference in the script is in the root directory with the script. Any ideas?

Thanks,

Craig

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Warning: imagefilledrectangle(): supplied argument is not a valid Image resource in /home/content/68/6372768/html/captcha.php on line 19

Warning: imageline(): supplied argument is not a valid Image resource in /home/content/68/6372768/html/captcha.php on line 22

Warning: imagesetpixel(): supplied argument is not a valid Image resource in /home/content/68/6372768/html/captcha.php on line 27

Warning: imagettftext() expects parameter 1 to be resource, null given in /home/content/68/6372768/html/captcha.php on line 30

Warning: imagedestroy(): supplied argument is not a valid Image resource in /home/content/68/6372768/html/captcha.php on line 35

<?php
session_start();

  // Set some important CAPTCHA constants
  define('CAPTCHA_NUMCHARS', 6);  // number of characters in pass-phrase
  define('CAPTCHA_WIDTH', 100);   // width of image
  define('CAPTCHA_HEIGHT', 25);   // height of image

  // Generate the random pass-phrase
  $pass_phrase = "";
  for ($i = 0; $i < CAPTCHA_NUMCHARS; $i++) {
    $pass_phrase .= chr(rand(97, 122));
  }

  // Store the encrypted pass-phrase in a session variable
  $_SESSION['pass_phrase'] = sha1($pass_phrase);

  // Create the image
  $img = imagecreatetruecolor(CAPTCHA_WIDTH, CAPTCHA_HEIGHT);

  // Set a white background with black text and gray graphics
  $bg_color = imagecolorallocate($img, 255, 255, 255);     // white
  $text_color = imagecolorallocate($img, 0, 0, 0);         // black
  $graphic_color = imagecolorallocate($img, 64, 64, 64);   // dark gray

  // Fill the background
  imagefilledrectangle($img, 0, 0, CAPTCHA_WIDTH, CAPTCHA_HEIGHT, $bg_color);

  // Draw some random lines
  for ($i = 0; $i < 5; $i++) {
    imageline($img, 0, rand() % CAPTCHA_HEIGHT, CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);
  }

  // Sprinkle in some random dots
  for ($i = 0; $i < 50; $i++) {
    imagesetpixel($img, rand() % CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);
  }

  // Draw the pass-phrase string
  imagettftext($img, 18, 0, 5, CAPTCHA_HEIGHT - 5, $text_color, 'Courier New Bold.ttf', $pass_phrase);

  // Output the image as a PNG using a header
  header("Content-type: image/png");
  imagepng($img);

  // Clean up
  imagedestroy($img);
?>

craigerjs · August 7, 2010

Another note, I just did a php info and all my GD stuff seems to be enabled.

GD Support enabled

GD Version bundled (2.0.34 compatible)

FreeType Support enabled

FreeType Linkage with freetype

FreeType Version 2.2.1

GIF Read Support enabled

GIF Create Support enabled

JPG Support enabled

PNG Support enabled

WBMP Support enabled

XBM Support enabled

jcbones · August 7, 2010

Add this:

// Create the image
  $img = imagecreatetruecolor(CAPTCHA_WIDTH, CAPTCHA_HEIGHT) or die('Cannot Initialize new GD image stream');

And see if the image is created. You have the right GD version for it.

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