Cara menggunakan imagejpeg php menyimpan gambar

<?php
  // make object from existing file
  $img = imagecreatefrompng('image.png');
  $watermark = imagecreatefrompng('watermark.png');
  
  // get original size
  $original_width = imagesx($watermark);
  $original_height = imagesy($watermark);
  
  // make new size, we make 10% from the size
  $new_width = $original_width * 0.1;
  $new_height = $original_height * 0.1;
  
  // chnage watermark size
  $watermark_resized = imagescale($watermark, $new_width, $new_height);
  
  // add watermark to image
  // explanation:
  // 10 first is x coordinate, 10 second is y coordinate
  // imagesx to get new width size, imagesy to get new height size
  imagecopy($img, $watermark_resized, 10, 10, 0, 0, imagesx($watermark_resized), imagesy($watermark_resized));
  
  // open the image
  header('Content-Type: image/png');
  imagepng($img);
  
  // uncomment below if you want to save the watermarked image 
  // imagepng($img, 'new_image.jpg', 100);
  
  
  // remove object from the memory
  imagedestroy($img);
  imagedestroy($watermark);
  imagedestroy($watermark_resized);
  
  ?>

<?php
  // make object from existing file
  $img = imagecreatefromjpeg('image.jpg');
  $watermark = imagecreatefromjpeg('watermark.jpg');
  
  // get original size
  $original_width = imagesx($watermark);
  $original_height = imagesy($watermark);
  
  // make new size, we make 10% from the size
  $new_width = $original_width * 0.1;
  $new_height = $original_height * 0.1;
  
  // chnage watermark size
  $watermark_resized = imagescale($watermark, $new_width, $new_height);
  
  // add watermark to image
  // explanation:
  // 10 first is x coordinate, 10 second is y coordinate
  // imagesx to get new width size, imagesy to get new height size
  imagecopy($img, $watermark_resized, 10, 10, 0, 0, imagesx($watermark_resized), imagesy($watermark_resized));
  
  // open the image
  header('Content-Type: image/jpeg');
  imagejpeg($img);
  
  // uncomment below if you want to save the watermarked image 
  // imagepng($img, 'new_image.jpg', 100);
  
  
  // remove object from the memory
  imagedestroy($img);
  imagedestroy($watermark);
  imagedestroy($watermark_resized);
  
  ?>