PHP大文件分割分片上传实现代码

发布:smiling　来源: PHP粉丝网　添加日期：2022-04-03 09:47:09　浏览: 评论：0　

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

<!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

    //对外方法，传入文件对象

    this.addFileAndSend = function(that){

      var file = that.files[0];

      blob = cutFile(file);

      sendFile(blob,file);

      blob_num += 1;

    }

    //停止文件上传

    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;

    };

    //发送文件

    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部分代码

<?php

class Upload{

  private $filepath = './upload'; //上传目录

  private $tmpPath; //PHP文件临时目录

  private $blobNum; //第几个文件块

  private $totalBlobNum; //文件块总数

  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

  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();

    }

  }



  //删除文件块

  private function deleteFileBlob(){

    for($i=1; $i<= $this->totalBlobNum; $i++){

      @unlink($this->filepath.'/'. $this->fileName.'__'.$i);

    }

  }



  //移动文件

  private function moveFile(){

    $this->touchDir();

    $filename = $this->filepath.'/'. $this->fileName.'__'.$this->blobNum;

    move_uploaded_file($this->tmpPath,$filename);

  }



  //API返回数据

  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);

  }



  //建立上传文件夹

  private function touchDir(){

    if(!file_exists($this->filepath)){

      return mkdir($this->filepath);

    }

  }

}

//实例化并获取系统变量传参

$upload = new Upload($_FILES['file']['tmp_name'],$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']);

//调用方法，返回结果

$upload->apiReturn();