php代码
png
if(function_exists("imagejpeg")){
header("content-type:image/jpeg\r\n");
imagejpeg($im);
}else{
header("content-type:image/png\r\n");
imagepng($im);
}
ImageDestroy($im);
}else{ //不支持GD，只输出字母 ABCD
//PutCookie("dd_ckstr","abcd",1800,"/");
session_register('dd_ckstr');
$_SESSION['dd_ckstr'] = "abcd";
header("content-type:image/jpeg\r\n");
header("Pragma:no-cache\r\n");
header("Cache-Control:no-cache\r\n");
header("Expires:0\r\n");
$fp = fopen("./vdcode.jpg","r");
echo fread($fp,filesize("./vdcode.jpg"));
fclose($fp);
}
?>
