<?
@session_start();

$FONTS = "./samples/fonts";

// leeres weißes Bild erzeugen
//$image = imagecreatetruecolor(155,40);
$image = imagecreatetruecolor(105,40);
$bgColor = ImageColorAllocate($image, 255, 255, 255);
//ImageFilledRectangle($image, 0, 0, 155, 40, $bgColor);
ImageFilledRectangle($image, 0, 0, 105, 40, $bgColor);

// Schriftfarbe
$color = imagecolorallocate($image,0,0,0);

// Schriftgröße
$size=20;

// unsere Zufallszahlen
$A = get_rand_id(1);
$B = get_rand_id(1);
$C = get_rand_id(1);
$D = get_rand_id(1);
//$E = get_rand_id(1);
//$F = get_rand_id(1);

// Zahlen auf das Bild zeichnen, Position etwas variieren, zufällig eine Schriftart auswählen (1.ttf-7.ttf)
imagettftext($image, $size, 0, 5, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$A);
imagettftext($image, $size, 0, 30, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$B);
imagettftext($image, $size, 0, 55, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$C);
imagettftext($image, $size, 0, 80, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$D);
//imagettftext($image, $size, 0, 105, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$E);
//imagettftext($image, $size, 0, 130, 25+rand(0,10), $color, $FONTS.'/'.rand(1,3).'.ttf',$F);

// Header für JPEG-Bild ausgeben
header("Content-type: image/gif");

// Bild ausgeben und im Verzeichnis abspeichern, Dateiname aus den Zufallszahlen bilden
imagejpeg($image);
//$_SESSION['downloadCode']=$A.$B.$C.$D.$E.$F;
$_SESSION['downloadCode']=$A.$B.$C.$D;


// Speicher vom Bild wieder freigeben, besser ist das ;-)
imagedestroy($image);

// Funktionen zur Erzeugung der Zufallszahlen
function assign_rand_value($num)
{
// accepts 1 - 36
  switch($num)
  {
    case "1":
     $rand_value = "a";
    break;
    case "2":
     $rand_value = "b";
    break;
    case "3":
     $rand_value = "c";
    break;
    case "4":
     $rand_value = "d";
    break;
    case "5":
     $rand_value = "e";
    break;
    case "6":
     $rand_value = "f";
    break;
    case "7":
     $rand_value = "g";
    break;
    case "8":
     $rand_value = "h";
    break;
    case "9":
     $rand_value = "i";
    break;
    case "10":
     $rand_value = "j";
    break;
    case "11":
     $rand_value = "k";
    break;
    case "12":
     $rand_value = "l";
    break;
    case "13":
     $rand_value = "m";
    break;
    case "14":
     $rand_value = "n";
    break;
    case "15":
     $rand_value = "o";
    break;
    case "16":
     $rand_value = "p";
    break;
    case "17":
     $rand_value = "q";
    break;
    case "18":
     $rand_value = "r";
    break;
    case "19":
     $rand_value = "s";
    break;
    case "20":
     $rand_value = "t";
    break;
    case "21":
     $rand_value = "u";
    break;
    case "22":
     $rand_value = "v";
    break;
    case "23":
     $rand_value = "w";
    break;
    case "24":
     $rand_value = "x";
    break;
    case "25":
     $rand_value = "y";
    break;
    case "26":
     $rand_value = "z";
    break;
    case "27":
     $rand_value = "0";
    break;
    case "28":
     $rand_value = "1";
    break;
    case "29":
     $rand_value = "2";
    break;
    case "30":
     $rand_value = "3";
    break;
    case "31":
     $rand_value = "4";
    break;
    case "32":
     $rand_value = "5";
    break;
    case "33":
     $rand_value = "6";
    break;
    case "34":
     $rand_value = "7";
    break;
    case "35":
     $rand_value = "8";
    break;
    case "36":
     $rand_value = "9";
    break;
  }
return $rand_value;
}

function get_rand_id($length)
{
  if($length>0) 
  { 
  $rand_id="";
   for($i=1; $i<=$length; $i++)
   {
   mt_srand((double)microtime() * 1000000);
   $num = mt_rand(1,36);
   $rand_id .= assign_rand_value($num);
   }
  }
return $rand_id;
}

function get_rand_numbers($length)
{
  if($length>0) 
  { 
  $rand_id="";
   for($i=1; $i<=$length; $i++)
   {
   mt_srand((double)microtime() * 1000000);
   $num = mt_rand(27,36);
   $rand_id .= assign_rand_value($num);
   }
  }
return $rand_id;
}

function get_rand_letters($length)
{
  if($length>0) 
  { 
  $rand_id="";
   for($i=1; $i<=$length; $i++)
   {
   mt_srand((double)microtime() * 1000000);
   $num = mt_rand(1,26);
   $rand_id .= assign_rand_value($num);
   }
  }
return $rand_id;
}
?>