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当我使用这个 php 脚本时得到空白图像，请帮忙！cropper.js 用于裁剪 php 脚本没有得到裁剪文件只有空白文件不是图像！

define('UPLOAD_DIR', './upload/');
$img = $_POST['avatar'];
$img = str_replace('data:image/jpeg;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = uniqid() . '.jpg';
$path = UPLOAD_DIR . $file;
$success = file_put_contents($path, $data);

<script>
    window.addEventListener('DOMContentLoaded', function () {
      var avatar = document.getElementById('avatar');
      var image = document.getElementById('image');
      var input = document.getElementById('input');
      var $progress = $('.progress');
      var $progressBar = $('.progress-bar');
      var $alert = $('.alert');
      var $modal = $('#modal');
      var cropper;

      $('[data-toggle="tooltip"]').tooltip();

      input.addEventListener('change', function (e) {
        var files = e.target.files;
        var done = function (url) {
          input.value = '';
          image.src = url;
          $alert.hide();
          $modal.modal('show');
        };
        var reader;
        var file;
        var url;

        if (files && files.length > 0) {
          file = files[0];

          if (URL) {
            done(URL.createObjectURL(file));
          } else if (FileReader) {
            reader = new FileReader();
            reader.onload = function (e) {
              done(reader.result);
            };
            reader.readAsDataURL(file);
          }
        }
      });

      $modal.on('shown.bs.modal', function () {
        cropper = new Cropper(image, {
          aspectRatio: 1,
          viewMode: 3,
        });
      }).on('hidden.bs.modal', function () {
        cropper.destroy();
        cropper = null;
      });

      document.getElementById('crop').addEventListener('click', function () {
        var initialAvatarURL;
        var canvas;

        $modal.modal('hide');

        if (cropper) {
          canvas = cropper.getCroppedCanvas({
            width: 160,
            height: 160,
          });

          initialAvatarURL = avatar.src;
          avatar.src = canvas.toDataURL();
          $progress.show();
          $alert.removeClass('alert-success alert-warning');
          canvas.toBlob(function (blob) {
            var formData = new FormData();

            formData.append('avatar', blob);

            $.ajax('upload.php', {
              method: 'POST',
              data: formData,
              processData: false,
              contentType: false,

              xhr: function () {
                var xhr = new XMLHttpRequest();

                xhr.upload.onprogress = function (e) {
                  var percent = '0';
                  var percentage = '0%';

                  if (e.lengthComputable) {
                    percent = Math.round((e.loaded / e.total) * 100);
                    percentage = percent + '%';
                    $progressBar.width(percentage).attr('aria-valuenow', percent).text(percentage);
                  }
                };

                return xhr;
              },

              success: function () {
                $alert.show().addClass('alert-success').text('Upload success');
              },

              error: function () {
                avatar.src = initialAvatarURL;
                $alert.show().addClass('alert-warning').text('Upload error');
              },

              complete: function () {
                $progress.hide();
              },
            });
          });
        }
      });
    });
  </script>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>Cropper.js</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
  <link rel="stylesheet" href="../dist/cropper.css">
  <style>
    .label {
      cursor: pointer;
    }

    .progress {
      display: none;
      margin-bottom: 1rem;
    }

    .alert {
      display: none;
    }

    .img-container img {
      max-width: 100%;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>Upload cropped image to server</h1>
    <label class="label" data-toggle="tooltip" title="Change your avatar">
      <img class="rounded" id="avatar" src="https://avatars0.githubusercontent.com/u/3456749?s=160" alt="avatar">
      <input type="file" class="sr-only" id="input" name="image" accept="image/*">
    </label>
    <div class="progress">
      <div class="progress-bar progress-bar-striped progress-bar-animated" role="progressbar" aria-valuenow="0" aria-valuemin="0" aria-valuemax="100">0%</div>
    </div>
    <div class="alert" role="alert"></div>
    <div class="modal fade" id="modal" tabindex="-1" role="dialog" aria-labelledby="modalLabel" aria-hidden="true">
      <div class="modal-dialog" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <h5 class="modal-title" id="modalLabel">Crop the image</h5>
            <button type="button" class="close" data-dismiss="modal" aria-label="Close">
              <span aria-hidden="true">&times;</span>
            </button>
          </div>
          <div class="modal-body">
            <div class="img-container">
              <img id="image" src="https://avatars0.githubusercontent.com/u/3456749">
            </div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
            <button type="button" class="btn btn-primary" id="crop">Crop</button>
          </div>
        </div>
      </div>
    </div>
  </div>

  <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.bundle.min.js"></script>
  <script src="../dist/cropper.js"></script></body></html>

当我使用这个 php 脚本时得到空白图像，请帮忙！cropper.js 用于裁剪 php 脚本没有得到裁剪文件只有空白文件不是图像！

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