verimage.php

<?php

/*
 * @version 0.1 (auto-set)
 */

Define('IWIDTH', 120);
Define('IHEIGHT', 20);
Define('TEXTLENGTH', 5);
Define('FROMFILE', './lib/codebook.txt');
Define('FONT', './lib/_vimage_tahoma.ttf');

include_once("./lib/general.class.php");

if (!defined('ENVIRONMENT'))
{
   error_reporting(E_ALL ^ E_NOTICE ^ E_DEPRECATED ^ E_STRICT);
   ini_set('display_errors', 0);
}

$position = (int)$_GET['n'];

$file    = fopen(FROMFILE, "r");
$content = fread($file, filesize(FROMFILE));
fclose($file);

while ($position > strlen($content))
   $position -= strlen($content);

$text = substr($content, $position, 3 * TEXTLENGTH);

$text = preg_replace("/[^a-zA-Z0-9]+/", '', $text);
$text = substr($text, 0, TEXTLENGTH);
$text = strtolower($text);

header("Content-type: image/png");

$im = ImageCreate(IWIDTH, IHEIGHT);

if ($im === false)
   die("Cannot Initialize new GD image stream");

$background_color = ImageColorAllocate($im, 255, 255, 255);
$text_color       = ImageColorAllocate($im, 233, 14, 91);
  
imagefill($im, 0, 0, $background_color);

$xpos  = rand(1, IWIDTH - 50);
$color = ImageColorAllocate($im, rand(0, 150), rand(0, 170), rand(0, 140));

for ($i = 0; $i < 500; $i++)
{
   $imageColor = ImageColorAllocate($im, rand(195, 205), rand(195, 205), rand(195, 205));
   imagesetpixel($im, rand(0, IWIDTH), rand(0, IHEIGHT), $imageColor);
}

imagestring($im, 5, $xpos, rand(0, IHEIGHT - 16), $text, $color);
  
// comment if not works
/*
   for ($i = 0; $i < strlen($text); $i++)
   {
      $angle = rand(0, 15);

      if (rand(0, 1) == 0)
         $angle = -$angle;

      $size  = rand(20, 25);
      $color = ImageColorAllocate($im, rand(0, 200), rand(0, 200), rand(0, 200));
      $box   = ImageTTFBBox($size, $angle, FONT, substr($text,$i,1));

      ImageTTFText($im, $size, $angle, $xpos, 50, $color, FONT, substr($text, $i, 1));
      $xpos += max($box[2], $box[4]) + rand(2, 6);
   }
*/

// debmes('Image output');

ImagePng($im);
ImageDestroy($im);

// print_r($text);