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<?php  $width = 100; //imagesx($im)  $height =40; //imagesy($im)  $im = Imagecreatetruecolor($width, $height);  $white = ImageColorAllocate($im, 255, 255, 255);  $black = ImageColorAllocate($im, 0, 0, 0);  $string = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789";  $string = substr(str_shuffle($string), 0, 8);  ImageFill($im, 0, 0, $black);  for($i=0;$i<(($width*$height)/(imagefontwidth(5)*imagefontheight(5)))*4;$i++){    imagesetpixel($im,rand(0,$width),rand(0,$height),$red);    imagesetpixel($im,rand(0,$width),rand(0,$height),$green);    imagesetpixel($im,rand(0,$width),rand(0,$height),$blue);  }  Header("Expires: Thurs, 16 Jul 1987 09:00:00 GMT");  Header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");  Header("Cache-Control: no-store, no-cache, must-revalidate");  Header("Cache-Control: post-check=0, pre-check=0", false);  Header("Pragma: no-cache");  Header('Content-type: image/jpeg');  Imagejpeg($im);  ImageDestroy($im);?>