hola tengo este codigo en php para guardar una imagen pero el problema es que la instruccion header al usarla no deja escribir ningun texto para ser mostrado en la web:

<?php
session_start();
$usuario = $_SESSION['usuario_d'];
$destino = "images/".$usuario."/nueva.jpg";
$res = json_decode(stripslashes($_POST['jsondata']), true);
/* get data */
$count_images = count($res['images']);
/* the background image is the first one */
$background    = $res['images'][0]['src'];
$photo1       = imagecreatefromjpeg($background);
$foto1W       = imagesx($photo1);
$foto1H       = imagesy($photo1);
$photoFrameW    = $res['images'][0]['width'];
$photoFrameH    = $res['images'][0]['height'];
$photoFrame    = imagecreatetruecolor($photoFrameW,$photoFrameH);
imagecopyresampled($photoFrame, $photo1, 0, 0, 0, 0, $photoFrameW, $photoFrameH, $foto1W, $foto1H);

/* the other images */
for($i = 1; $i < $count_images; ++$i){
   $insert       = $res['images'][$i]['src'];
   $photoFrame2Rotation = (180-$res['images'][$i]['rotation']) + 180;
   
   $photo2       = imagecreatefrompng($insert);
   
   $foto2W       = imagesx($photo2);
   $foto2H       = imagesy($photo2);
   $photoFrame2W   = $res['images'][$i]['width'];
   $photoFrame2H    = $res['images'][$i]['height'];

   $photoFrame2TOP = $res['images'][$i]['top'];
   $photoFrame2LEFT= $res['images'][$i]['left'];

   $photoFrame2    = imagecreatetruecolor($photoFrame2W,$photoFrame2H);
   $trans_colour    = imagecolorallocatealpha($photoFrame2, 0, 0, 0, 127);
   imagefill($photoFrame2, 0, 0, $trans_colour);

   imagecopyresampled($photoFrame2, $photo2, 0, 0, 0, 0, $photoFrame2W, $photoFrame2H, $foto2W, $foto2H);
   
   $photoFrame2    = imagerotate($photoFrame2,$photoFrame2Rotation, -1,0);
   /*after rotating calculate the difference of new height/width with the one before*/
   $extraTop      =(imagesy($photoFrame2)-$photoFrame2H)/2;
   $extraLeft      =(imagesx($photoFrame2)-$photoFrame2W)/2;

   imagecopy($photoFrame, $photoFrame2,$photoFrame2LEFT-$extraLeft, $photoFrame2TOP-$extraTop, 0, 0, imagesx($photoFrame2), imagesy($photoFrame2));   
}
// Set the content type header - in this case image/jpeg


header('Content-type: image/jpeg');
imagejpeg($photoFrame,$destino,100);
imagejpeg($photoFrame);
imagedestroy($photoFrame);

?> 



si alguien me pudiese ayudar se lo agradeceria