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PHP大文件分割上傳 PHP分片上傳

 更新時間：2017年08月28日 14:45:19   作者：ノGHJ  
這篇文章主要為大家詳細(xì)介紹了PHP大文件分割上傳，PHP分片上傳，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

服務(wù)端為什么不能直接傳大文件？跟php.ini里面的幾個配置有關(guān)

upload_max_filesize = 2M //PHP最大能接受的文件大小
post_max_size = 8M //PHP能收到的最大POST值'
memory_limit = 128M //內(nèi)存上限
max_execution_time = 30 //最大執(zhí)行時間

當(dāng)然不能簡單粗暴的把上面幾個值調(diào)大，否則服務(wù)器內(nèi)存資源吃光是遲早的問題。

解決思路

好在HTML5開放了新的FILE API，也可以直接操作二進(jìn)制對象，我們可以直接在瀏覽器端實(shí)現(xiàn)文件切割，按照以前的做法就得用Flash的方案，實(shí)現(xiàn)起來會麻煩很多。

JS思路
1.監(jiān)聽上傳按鈕的onchange事件
2.獲取文件的FILE對象
3.把文件的FILE對象進(jìn)行切割，并且附加到FORMDATA對象中
4.把FORMDATA對象通過AJAX發(fā)送到服務(wù)器
5.重復(fù)3、4步驟，直到文件發(fā)送完。

PHP思路
1.建立上傳文件夾
2.把文件從上傳臨時目錄移動到上傳文件夾
3.所有的文件塊上傳完成后，進(jìn)行文件合成
4.刪除文件夾
5.返回上傳后的文件路徑

DEMO代碼

前端部分代碼

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport"
   content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>Document</title>
 <style>
  #progress{
   width: 300px;
   height: 20px;
   background-color:#f7f7f7;
   box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);
   border-radius:4px;
   background-image:linear-gradient(to bottom,#f5f5f5,#f9f9f9);
  }

  #finish{
   background-color: #149bdf;
   background-image:linear-gradient(45deg,rgba(255,255,255,0.15) 25%,transparent 25%,transparent 50%,rgba(255,255,255,0.15) 50%,rgba(255,255,255,0.15) 75%,transparent 75%,transparent);
   background-size:40px 40px;
   height: 100%;
  }
  form{
   margin-top: 50px;
  }
 </style>
</head>
<body>
<div id="progress">
 <div id="finish" style="width: 0%;" progress="0"></div>
</div>
<form action="./upload.php">
 <input type="file" name="file" id="file">
 <input type="button" value="停止" id="stop">
</form>
<script>
 var fileForm = document.getElementById("file");
 var stopBtn = document.getElementById('stop');
 var upload = new Upload();

 fileForm.onchange = function(){
  upload.addFileAndSend(this);
 }

 stopBtn.onclick = function(){
  this.value = "停止中";
  upload.stop();
  this.value = "已停止";
 }

 function Upload(){
  var xhr = new XMLHttpRequest();
  var form_data = new FormData();
  const LENGTH = 1024 * 1024;
  var start = 0;
  var end = start + LENGTH;
  var blob;
  var blob_num = 1;
  var is_stop = 0
  //對外方法，傳入文件對象
  this.addFileAndSend = function(that){
   var file = that.files[0];
   blob = cutFile(file);
   sendFile(blob,file);
   blob_num += 1;
  }
  //停止文件上傳
  this.stop = function(){
   xhr.abort();
   is_stop = 1;
  }
  //切割文件
  function cutFile(file){
   var file_blob = file.slice(start,end);
   start = end;
   end = start + LENGTH;
   return file_blob;
  };
  //發(fā)送文件
  function sendFile(blob,file){
   var total_blob_num = Math.ceil(file.size / LENGTH);
   form_data.append('file',blob);
   form_data.append('blob_num',blob_num);
   form_data.append('total_blob_num',total_blob_num);
   form_data.append('file_name',file.name);

   xhr.open('POST','./upload.php',false);
   xhr.onreadystatechange = function () {
    var progress;
    var progressObj = document.getElementById('finish');
    if(total_blob_num == 1){
     progress = '100%';
    }else{
     progress = Math.min(100,(blob_num/total_blob_num)* 100 ) +'%';
    }
    progressObj.style.width = progress;
    var t = setTimeout(function(){
     if(start < file.size && is_stop === 0){
      blob = cutFile(file);
      sendFile(blob,file);
      blob_num += 1;
     }else{
      setTimeout(t);
     }
    },1000);
   }
   xhr.send(form_data);
  }
 }

</script>
</body>
</html>

PHP部分代碼

<?php
class Upload{
 private $filepath = './upload'; //上傳目錄
 private $tmpPath; //PHP文件臨時目錄
 private $blobNum; //第幾個文件塊
 private $totalBlobNum; //文件塊總數(shù)
 private $fileName; //文件名

 public function __construct($tmpPath,$blobNum,$totalBlobNum,$fileName){
  $this->tmpPath = $tmpPath;
  $this->blobNum = $blobNum;
  $this->totalBlobNum = $totalBlobNum;
  $this->fileName = $fileName;
  
  $this->moveFile();
  $this->fileMerge();
 }
 
 //判斷是否是最后一塊，如果是則進(jìn)行文件合成并且刪除文件塊
 private function fileMerge(){
  if($this->blobNum == $this->totalBlobNum){
   $blob = '';
   for($i=1; $i<= $this->totalBlobNum; $i++){
    $blob .= file_get_contents($this->filepath.'/'. $this->fileName.'__'.$i);
   }
   file_put_contents($this->filepath.'/'. $this->fileName,$blob);
   $this->deleteFileBlob();
  }
 }
 
 //刪除文件塊
 private function deleteFileBlob(){
  for($i=1; $i<= $this->totalBlobNum; $i++){
   @unlink($this->filepath.'/'. $this->fileName.'__'.$i);
  }
 }
 
 //移動文件
 private function moveFile(){
  $this->touchDir();
  $filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum;
  move_uploaded_file($this->tmpPath,$filename);
 }
 
 //API返回數(shù)據(jù)
 public function apiReturn(){
  if($this->blobNum == $this->totalBlobNum){
    if(file_exists($this->filepath.'/'. $this->fileName)){
     $data['code'] = 2;
     $data['msg'] = 'success';
     $data['file_path'] = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['DOCUMENT_URI']).str_replace('.','',$this->filepath).'/'. $this->fileName;
    }
  }else{
    if(file_exists($this->filepath.'/'. $this->fileName.'__'.$this->blobNum)){
     $data['code'] = 1;
     $data['msg'] = 'waiting for all';
     $data['file_path'] = '';
    }
  }
  header('Content-type: application/json');
  echo json_encode($data);
 }
 
 //建立上傳文件夾
 private function touchDir(){
  if(!file_exists($this->filepath)){
   return mkdir($this->filepath);
  }
 }
}

//實(shí)例化并獲取系統(tǒng)變量傳參
$upload = new Upload($_FILES['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']);
//調(diào)用方法，返回結(jié)果
$upload->apiReturn();

本文已被整理到了《php文件上傳操作匯總》 ，更多精彩內(nèi)容，歡迎大家學(xué)習(xí)閱讀。

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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