php结合web uploader插件实现分片上传文件

<!--引入CSS-->
<link rel="stylesheet" type="text/css" href="webuploader文件夹/webuploader.css">

<!--引入JS-->
<script type="text/javascript" src="webuploader文件夹/webuploader.js"></script>

<div id="uploader" class="wu-example">
 <!--用来存放文件信息-->
 <div id="thelist" class="uploader-list"></div>
 <div class="btns">
  <div id="picker">选择文件</div>
  <button id="ctlBtn" class="btn btn-default">开始上传   </button>
 </div>
 </div>

jQuery(function() {
  $list = $('#thelist'),
   $btn = $('#ctlBtn'),
   state = 'pending',
   uploader;

  uploader = WebUploader.create({
   // 不压缩image
   resize: false,
   // swf文件路径
   swf: 'uploader.swf',
   // 文件接收服务端。
   server: upload.php,
   // 选择文件的按钮。可选。
   // 内部根据当前运行是创建，可能是input元素，也可能是flash.
   pick: '#picker',
   chunked: true,
   chunkSize:2*1024*1024,
   auto: true,
   accept: {
    title: 'Images',
    extensions: 'gif,jpg,jpeg,bmp,png',
    mimeTypes: 'image/*'
   }
  });

header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
  header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  header("Cache-Control: no-store, no-cache, must-revalidate");
  header("Cache-Control: post-check=0, pre-check=0", false);
  header("Pragma: no-cache");

  if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {
   exit; // finish preflight CORS requests here
  }
  if ( !empty($_REQUEST[ 'debug' ]) ) {
   $random = rand(0, intval($_REQUEST[ 'debug' ]) );
   if ( $random === 0 ) {
    header("HTTP/1.0 500 Internal Server Error");
    exit;
   }
  }

  // header("HTTP/1.0 500 Internal Server Error");
  // exit;
  // 5 minutes execution time
  @set_time_limit(5 * 60);
  // Uncomment this one to fake upload time
  // usleep(5000);
  // Settings
  // $targetDir = ini_get("upload_tmp_dir") . DIRECTORY_SEPARATOR . "plupload";
  $targetDir = 'uploads'.DIRECTORY_SEPARATOR.'file_material_tmp';
  $uploadDir = 'uploads'.DIRECTORY_SEPARATOR.'file_material';
  $cleanupTargetDir = true; // Remove old files
  $maxFileAge = 5 * 3600; // Temp file age in seconds
  // Create target dir
  if (!file_exists($targetDir)) {
   @mkdir($targetDir);
  }
  // Create target dir
  if (!file_exists($uploadDir)) {
   @mkdir($uploadDir);
  }
  // Get a file name
  if (isset($_REQUEST["name"])) {
   $fileName = $_REQUEST["name"];
  } elseif (!empty($_FILES)) {
   $fileName = $_FILES["file"]["name"];
  } else {
   $fileName = uniqid("file_");
  }
  $oldName = $fileName;
  $filePath = $targetDir . DIRECTORY_SEPARATOR . $fileName;
  // $uploadPath = $uploadDir . DIRECTORY_SEPARATOR . $fileName;
  // Chunking might be enabled
  $chunk = isset($_REQUEST["chunk"]) ? intval($_REQUEST["chunk"]) : 0;
  $chunks = isset($_REQUEST["chunks"]) ? intval($_REQUEST["chunks"]) : 1;
  // Remove old temp files
  if ($cleanupTargetDir) {
   if (!is_dir($targetDir) || !$dir = opendir($targetDir)) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 100, "message": "Failed to open temp directory."}, "id" : "id"}');
   }
   while (($file = readdir($dir)) !== false) {
    $tmpfilePath = $targetDir . DIRECTORY_SEPARATOR . $file;
    // If temp file is current file proceed to the next
    if ($tmpfilePath == "{$filePath}_{$chunk}.part" || $tmpfilePath == "{$filePath}_{$chunk}.parttmp") {
     continue;
    }
    // Remove temp file if it is older than the max age and is not the current file
    if (preg_match('/\.(part|parttmp)$/', $file) && (@filemtime($tmpfilePath) < time() - $maxFileAge)) {
     @unlink($tmpfilePath);
    }
   }
   closedir($dir);
  }

  // Open temp file
  if (!$out = @fopen("{$filePath}_{$chunk}.parttmp", "wb")) {
   die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
  }
  if (!empty($_FILES)) {
   if ($_FILES["file"]["error"] || !is_uploaded_file($_FILES["file"]["tmp_name"])) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 103, "message": "Failed to move uploaded file."}, "id" : "id"}');
   }
   // Read binary input stream and append it to temp file
   if (!$in = @fopen($_FILES["file"]["tmp_name"], "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
   }
  } else {
   if (!$in = @fopen("php://input", "rb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 101, "message": "Failed to open input stream."}, "id" : "id"}');
   }
  }
  while ($buff = fread($in, 4096)) {
   fwrite($out, $buff);
  }
  @fclose($out);
  @fclose($in);
  rename("{$filePath}_{$chunk}.parttmp", "{$filePath}_{$chunk}.part");
  $index = 0;
  $done = true;
  for( $index = 0; $index < $chunks; $index   ) {
   if ( !file_exists("{$filePath}_{$index}.part") ) {
    $done = false;
    break;
   }
  }



  if ( $done ) {
   $pathInfo = pathinfo($fileName);
   $hashStr = substr(md5($pathInfo['basename']),8,16);
   $hashName = time() . $hashStr . '.' .$pathInfo['extension'];
   $uploadPath = $uploadDir . DIRECTORY_SEPARATOR .$hashName;

   if (!$out = @fopen($uploadPath, "wb")) {
    die('{"jsonrpc" : "2.0", "error" : {"code": 102, "message": "Failed to open output stream."}, "id" : "id"}');
   }
   if ( flock($out, LOCK_EX) ) {
    for( $index = 0; $index < $chunks; $index   ) {
     if (!$in = @fopen("{$filePath}_{$index}.part", "rb")) {
      break;
     }
     while ($buff = fread($in, 4096)) {
      fwrite($out, $buff);
     }
     @fclose($in);
     @unlink("{$filePath}_{$index}.part");
    }
    flock($out, LOCK_UN);
   }
   @fclose($out);
   $response = [
    'success'=>true,
    'oldName'=>$oldName,
    'filePaht'=>$uploadPath,
    'fileSize'=>$data['size'],
    'fileSuffixes'=>$pathInfo['extension'],
    'file_id'=>$data['id'],
    ];

   die(json_encode($response));
  }

  // Return Success JSON-RPC response
  die('{"jsonrpc" : "2.0", "result" : null, "id" : "id"}');