헤더에 이미지 날리기

if(file_exists($file_full_path) == false) {
  header ("HTTP/1.0 404 Not Found");
  exit;
 }
 //echo $file_full_path;
 //exit;
 header("Content-type: image/jpeg");
 header("Content-Disposition: inline; filename=$file_full_path");
 header("Content-length:" . filesize("$file_full_path"));
 readfile("$file_full_path");
 exit;