django cant upload images in app engine code example

Example 1: image upload in php code with databases

<?php
  // Create database connection
  $db = mysqli_connect("localhost", "root", "", "image_upload");

  // Initialize message variable
  $msg = "";

  // If upload button is clicked ...
  if (isset($_POST['upload'])) {
  	// Get image name
  	$image = $_FILES['image']['name'];
  	// Get text
  	$image_text = mysqli_real_escape_string($db, $_POST['image_text']);

  	// image file directory
  	$target = "images/".basename($image);

  	$sql = "INSERT INTO images (image, image_text) VALUES ('$image', '$image_text')";
  	// execute query
  	mysqli_query($db, $sql);

  	if (move_uploaded_file($_FILES['image']['tmp_name'], $target)) {
  		$msg = "Image uploaded successfully";
  	}else{
  		$msg = "Failed to upload image";
  	}
  }
  $result = mysqli_query($db, "SELECT * FROM images");
?>
<!DOCTYPE html>
<html>
<head>
<title>Image Upload</title>
<style type="text/css">
   #content{
   	width: 50%;
   	margin: 20px auto;
   	border: 1px solid #cbcbcb;
   }
   form{
   	width: 50%;
   	margin: 20px auto;
   }
   form div{
   	margin-top: 5px;
   }
   #img_div{
   	width: 80%;
   	padding: 5px;
   	margin: 15px auto;
   	border: 1px solid #cbcbcb;
   }
   #img_div:after{
   	content: "";
   	display: block;
   	clear: both;
   }
   img{
   	float: left;
   	margin: 5px;
   	width: 300px;
   	height: 140px;
   }
</style>
</head>
<body>
<div id="content">
  <?php
    while ($row = mysqli_fetch_array($result)) {
      echo "<div id='img_div'>";
      	echo "<img src='images/".$row['image']."' >";
      	echo "<p>".$row['image_text']."</p>";
      echo "</div>";
    }
  ?>
  <form method="POST" action="index.php" enctype="multipart/form-data">
  	<input type="hidden" name="size" value="1000000">
  	<div>
  	  <input type="file" name="image">
  	</div>
  	<div>
      <textarea 
      	id="text" 
      	cols="40" 
      	rows="4" 
      	name="image_text" 
      	placeholder="Say something about this image..."></textarea>
  	</div>
  	<div>
  		<button type="submit" name="upload">POST</button>
  	</div>
  </form>
</div>
</body>
</html>

Example 2: upload image with watermark in codeigniter

// Define it in configuration file. And call it
        // About configurations: https://codeigniter.com/user_guide/libraries/config.html
        $wm_font_size = 16; // Watermark height (font size) contains 16% of image 

        $this->load->library('upload');
        $this->load->library('image_lib');
        $config['image_library'] = 'GD2';

        for ($i = 0; $i < $number_of_files; $i++) {
                $_FILES['file']['name'] = $files['file']['name'][$i];
                $_FILES['file']['type'] = $files['file']['type'][$i];
                $_FILES['file']['tmp_name'] = $files['file']['tmp_name'][$i];
                $_FILES['file']['error'] = $files['file']['error'][$i];
                $_FILES['file']['size'] = $files['file']['size'][$i];
                $config['source_image'] = $files['file']['tmp_name'][$i];
                $config['wm_text'] = 'Copyright example.com';
                $config['wm_type'] = 'text';
                $config['wm_font_size'] = ceil($files['file'][image_height][$i]/100*wm_font_size);
                $config['wm_vrt_alignment'] = 'middle';
                $config['wm_hor_alignment'] = 'center';
                $this->image_lib->initialize($config);
                $this->image_lib->watermark();

                $config['source_image'] = $files['file']['tmp_name'][$i];
                $config['wm_overlay_path'] = './application/assets/images/example.png';
                $config['wm_type'] = 'overlay';
                $config['width'] = '50';
                $config['height'] = '50';
                $config['padding'] = '50';
                $config['wm_opacity'] = '100';
                $config['wm_vrt_alignment'] = 'bottom';
                $config['wm_hor_alignment'] = 'right';
                $config['wm_vrt_offset'] = '100';
                $this->image_lib->initialize($config);
                $this->image_lib->watermark();

                if (!$this->upload->do_upload("file")) {
                    $errors++;
                }

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