PHP大文件分割分片上传实现代码

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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" 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();

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持CodeAE代码之家。

[PHP] PHP大文件分割分片上传实现代码

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