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PHP大文件分割分片上传实现代码

发布于：2022-03-28 11:00:34  栏目：技术文档

这篇文章主要介绍了PHP大文件分割分片上传实现代码,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

服务端为什么不能直接传大文件？跟php.ini里面的几个配置有关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 //内存上限max_execution_time = 30 //最大执行时间当然不能简单粗暴的把上面几个值调大，否则服务器内存资源吃光是迟早的问题。解决思路好在HTML5开放了新的FILE API，也可以直接操作二进制对象，我们可以直接在浏览器端实现文件切割，按照以前的做法就得用Flash的方案，实现起来会麻烦很多。JS思路1.监听上传按钮的onchange事件2.获取文件的FILE对象3.把文件的FILE对象进行切割，并且附加到FORMDATA对象中4.把FORMDATA对象通过AJAX发送到服务器5.重复3、4步骤，直到文件发送完。PHP思路1.建立上传文件夹2.把文件从上传临时目录移动到上传文件夹3.所有的文件块上传完成后，进行文件合成4.删除文件夹5.返回上传后的文件路径DEMO代码前端部分代码

  1. <!doctype html>
  2. <html lang="en">
  3. <head>
  4.   <meta charset="UTF-8">
  5.   <meta name="viewport"
  6.      content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  7.   <meta http-equiv="X-UA-Compatible" content="ie=edge">
  8.   <title>Document</title>
  9.   <style>
  10.     #progress{
  11.       width: 300px;
  12.       height: 20px;
  13.       background-color:#f7f7f7;
  14.       box-shadow:inset 0 1px 2px rgba(0,0,0,0.1);
  15.       border-radius:4px;
  16.       background-image:linear-gradient(to bottom,#f5f5f5,#f9f9f9);
  17.     }
  19.     #finish{
  20.       background-color: #149bdf;
  21.       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);
  22.       background-size:40px 40px;
  23.       height: 100%;
  24.     }
  25.     form{
  26.       margin-top: 50px;
  27.     }
  28.   </style>
  29. </head>
  30. <body>
  31. <div id="progress">
  32.   <div id="finish" style="width: 0%;" progress="0"></div>
  33. </div>
  34. <form action="./upload.php">
  35.   <input type="file" name="file" id="file">
  36.   <input type="button" value="停止" id="stop">
  37. </form>
  38. <script>
  39.   var fileForm = document.getElementById("file");
  40.   var stopBtn = document.getElementById('stop');
  41.   var upload = new Upload();
  43.   fileForm.onchange = function(){
  44.     upload.addFileAndSend(this);
  45.   }
  47.   stopBtn.onclick = function(){
  48.     this.value = "停止中";
  49.     upload.stop();
  50.     this.value = "已停止";
  51.   }
  53.   function Upload(){
  54.     var xhr = new XMLHttpRequest();
  55.     var form_data = new FormData();
  56.     const LENGTH = 1024 * 1024;
  57.     var start = 0;
  58.     var end = start + LENGTH;
  59.     var blob;
  60.     var blob_num = 1;
  61.     var is_stop = 0
  62.     //对外方法，传入文件对象
  63.     this.addFileAndSend = function(that){
  64.       var file = that.files[0];
  65.       blob = cutFile(file);
  66.       sendFile(blob,file);
  67.       blob_num += 1;
  68.     }
  69.     //停止文件上传
  70.     this.stop = function(){
  71.       xhr.abort();
  72.       is_stop = 1;
  73.     }
  74.     //切割文件
  75.     function cutFile(file){
  76.       var file_blob = file.slice(start,end);
  77.       start = end;
  78.       end = start + LENGTH;
  79.       return file_blob;
  80.     };
  81.     //发送文件
  82.     function sendFile(blob,file){
  83.       var total_blob_num = Math.ceil(file.size / LENGTH);
  84.       form_data.append('file',blob);
  85.       form_data.append('blob_num',blob_num);
  86.       form_data.append('total_blob_num',total_blob_num);
  87.       form_data.append('file_name',file.name);
  89.       xhr.open('POST','./upload.php',false);
  90.       xhr.onreadystatechange = function () {
  91.         var progress;
  92.         var progressObj = document.getElementById('finish');
  93.         if(total_blob_num == 1){
  94.           progress = '100%';
  95.         }else{
  96.           progress = Math.min(100,(blob_num/total_blob_num)* 100 ) +'%';
  97.         }
  98.         progressObj.style.width = progress;
  99.         var t = setTimeout(function(){
  100.           if(start < file.size && is_stop === 0){
  101.             blob = cutFile(file);
  102.             sendFile(blob,file);
  103.             blob_num += 1;
  104.           }else{
  105.             setTimeout(t);
  106.           }
  107.         },1000);
  108.       }
  109.       xhr.send(form_data);
  110.     }
  111.   }
  113. </script>
  114. </body>
  115. </html>

PHP部分代码

  1. <?php
  2. class Upload{
  3.   private $filepath = './upload'; //上传目录
  4.   private $tmpPath; //PHP文件临时目录
  5.   private $blobNum; //第几个文件块
  6.   private $totalBlobNum; //文件块总数
  7.   private $fileName; //文件名
  9.   public function __construct($tmpPath,$blobNum,$totalBlobNum,$fileName){
  10.     $this->tmpPath = $tmpPath;
  11.     $this->blobNum = $blobNum;
  12.     $this->totalBlobNum = $totalBlobNum;
  13.     $this->fileName = $fileName;
  15.     $this->moveFile();
  16.     $this->fileMerge();
  17.   }
  19.   //判断是否是最后一块，如果是则进行文件合成并且删除文件块
  20.   private function fileMerge(){
  21.     if($this->blobNum == $this->totalBlobNum){
  22.       $blob = '';
  23.       for($i=1; $i<= $this->totalBlobNum; $i++){
  24.         $blob .= file_get_contents($this->filepath.'/'. $this->fileName.'__'.$i);
  25.       }
  26.       file_put_contents($this->filepath.'/'. $this->fileName,$blob);
  27.       $this->deleteFileBlob();
  28.     }
  29.   }
  31.   //删除文件块
  32.   private function deleteFileBlob(){
  33.     for($i=1; $i<= $this->totalBlobNum; $i++){
  34.       @unlink($this->filepath.'/'. $this->fileName.'__'.$i);
  35.     }
  36.   }
  38.   //移动文件
  39.   private function moveFile(){
  40.     $this->touchDir();
  41.     $filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum;
  42.     move_uploaded_file($this->tmpPath,$filename);
  43.   }
  45.   //API返回数据
  46.   public function apiReturn(){
  47.     if($this->blobNum == $this->totalBlobNum){
  48.         if(file_exists($this->filepath.'/'. $this->fileName)){
  49.           $data['code'] = 2;
  50.           $data['msg'] = 'success';
  51.           $data['file_path'] = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['DOCUMENT_URI']).str_replace('.','',$this->filepath).'/'. $this->fileName;
  52.         }
  53.     }else{
  54.         if(file_exists($this->filepath.'/'. $this->fileName.'__'.$this->blobNum)){
  55.           $data['code'] = 1;
  56.           $data['msg'] = 'waiting for all';
  57.           $data['file_path'] = '';
  58.         }
  59.     }
  60.     header('Content-type: application/json');
  61.     echo json_encode($data);
  62.   }
  64.   //建立上传文件夹
  65.   private function touchDir(){
  66.     if(!file_exists($this->filepath)){
  67.       return mkdir($this->filepath);
  68.     }
  69.   }
  70. }
  72. //实例化并获取系统变量传参
  73. $upload = new Upload($_FILES['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']);
  74. //调用方法，返回结果
  75. $upload->apiReturn();

以上就是本文的全部内容，希望对大家的学习有所帮助。

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