PHP Generate authentication Code source code

Session_Start ();

$ENABLEGD = 1;
$funcs = Array (' Imagecreatetruecolor ', ' imagecolorallocate ', ' Imagefill ', ' imagestring ', ' imageline ', ' imagerotate ', ' Imagedestroy ', ' imagecolorallocatealpha ', ' imageellipse ', ' imagepng ');
foreach ($funcs as $func)
{
if (!function_exists ($func))
{
$ENABLEGD = 0;
Break
}
}

Ob_clean ();

if ($ENABLEGD)
{
 //create captcha
  $consts = ' cdfgkmnpqrstwxyz23456 ';
  $vowels = ' aek23456789 ';
 for ($x = 0; $x < 6 $x + +)
 {
   $const [$x] = substr ($consts, Mt_rand (0,strlen ($consts )-1, 1);
   $vow [$x] = substr ($vowels, Mt_rand (0,strlen ($vowels)-1), 1);
 }
  $radomstring = $const [0]. $vow [0]. $const [2]. $const [1]. $vow [1]. $const [3]. $vow [3]. $const [4];
 $_session[' checkcode '] = $string = substr ($radomstring, 0,4);//only Display 4 str
 //set up image, the The the width and the second is the height
  $imageX = strlen ($radomstring) *8; //the image width
  $imageY = 20;      //the Image Height
  $im = Imagecreatetruecolor ($ ImageX, $imageY);

 //creates two variables to store color
  $background = Imagecolorallocate ($im, rand (180,), Rand (180, ), rand (180, 250));
  $FOREGROUNDARR = Array (imagecolorallocate ($im, rand (0), rand (0), rand (0)),
          imagecolorallocate ($im, rand (0), rand (0, ten), rand (245, 255)),
          imagecolorallocate ($im, rand (245, 255), rand (0), rand (0,),
          imagecolorallocate ($im, rand (245, 255), rand (0), rand (245, 255));
  $foreground 2 = Imagecolorallocatealpha ($im, Rand (a), Rand (a), Rand (20, 100), 80);
  $middleground = Imagecolorallocate ($im, rand (160), rand (160), Rand (200, 160));
  $middleground 2 = Imagecolorallocatealpha ($im, rand (180, 140), Rand (180, 140), Rand (180, 140), n);

Fill image with bgcolor
Imagefill ($im, 0, 0, imagecolorallocate ($im, 250, 253, 254));
Writes string
Imagettftext ($im, Rand ( -30), 5, Rand (a), $foregroundArr [Rand (0,3)], phpcms_root. ' Include/fonts/alger. TTF ', $string [0]);
Imagettftext ($im, Rand ( -50), Rand (a), $foregroundArr [Rand (0,3)], phpcms_root. ' Include/fonts/arialni. TTF ', $string [1]);
Imagettftext ($im, Rand ( -50), Rand (a), $foregroundArr [Rand (0,3)], phpcms_root. ' Include/fonts/alger. TTF ', $string [2]);
Imagettftext ($im, Rand ( -30), Rand (a), $foregroundArr [Rand (0,3)], phpcms_root. ' Include/fonts/arial.ttf ', $string [3]);

Strikethrough

$border = Imagecolorallocate ($im, 133, 153, 193);
Imagefilledrectangle ($aimg, 0, 0, $x _size-1, $y _size-1, $back);
Imagerectangle ($im, 0, 0, $imageX-1, $imageY-1, $border);

$pointcol = Imagecolorallocate ($im, Rand (0,255), Rand (0,255), Rand (0,255));
For ($i =0 $i <80; $i + +)
{
Imagesetpixel ($im, rand (2, $imageX-2), Rand (2, $imageX-2), $pointcol);
}
Random shapes
For ($x =0 $x <9; $x + +)
{
if (Mt_rand (0, $x)%2==0)
{
Imageline ($im, rand (0), rand (0,), rand (0), rand (0,), rand (0, 999999));
Imageellipse ($im, rand (0), rand (0,), rand (0), rand (0,), $middleground 2);
}
Else
{
Imageline ($im, rand (0), rand (0,), rand (0), rand (0,), rand (0, 999999));
Imageellipse ($im, rand (0), rand (0,), rand (0), rand (0,), $middleground);
}
}
Output to Browser
Header ("Content-type:image/pngrn");
Imagepng ($im);
Imagedestroy ($im);
}
Else
{
$files = Glob (phpcms_root. ' Images/checkcode/*.jpg ');
if (!is_array ($files)) exit ($LANG [' Please_check_dir_images_checkcode ']);

$checkcodefile = $files [Rand (0, COUNT ($files)-1)];
$_session[' checkcode '] = substr (basename ($checkcodefile), 0, 4);

Header ("Content-type:image/jpegrn");
Include $checkcodefile;
}