基于php+webuploader的大文件分片上传，带进度条，支持断点续传（刷新、关闭页面、重新上传、网络中断等情况）。文件上传前先检测该文件是否已上传，如果已上传提示“文件已存在”，如果未上传则直接上传。视频上传时会根据设定的参数（分片大小、分片数量）进行上传，上传过程中会在目标文件夹中生成一个临时文件夹，用于存储临时分片，等所有分片上传完毕后，会根据序号重新组合成一个完整的视频，临时文件被删除。

如果文件上传至七牛云，可参看基于php大文件分片上传至七牛云，带进度条

首先下载webuploader

效果图：

 临时文件，用于存储分片

html代码

<title>webuploader分片上传</title>
<meta charset="utf8">
<!--引入CSS-->
<link rel="stylesheet" type="text/css" href="/static/webupload/webuploader.css">
<script type="text/javascript" src="/static/index/js/jquery.js"></script>
<script type="text/javascript" src="/static/index/js/jquery.md5.js"></script>

<!--引入JS-->
<script type="text/javascript" src="/static/webupload/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>
<style>
    .progress{
        height: 20px; width: 300px; background: #ccc; }
    .progress-bar{
        height: 20px; background: #0a3536;}
</style>
<script>

    var uploadswf = '/static/webupload/Uploader.swf';
    var chunkSize = 2*1024*1024;
    var server_url='uploadVedio';
    var GUID = WebUploader.Base.guid();//一个GUID
    var chunkObj = {};  //用来记录文件的状态、上传中断的位置
    var seq=1;
    var msg='';
    $(function () {
        var $ = jQuery;
        var $list = $('#thelist');
        WebUploader.Uploader.register({
            "before-send-file":"beforeSendFile",
            "before-send": "beforeSend"
        }, {
            "beforeSendFile": function (file) {
                //上传前校验文件是否已经上传过
                var deferred = WebUploader.Deferred();
                $.ajax({
                    type:"POST",
                    //上传前校验文件上传到第几片
                    url: "checkFile",
                    data: {
                        seq: seq,
                        fileMd5: $.md5(file.name + file.size + file.ext),
                        fileName:file.name
                    },
                    dataType: "json",
                    success: function (data) {
                        console.log(data);
                        chunkObj = data;
                        chunkObj.type = data.type;
                        chunkObj.chunk == data.chunk;
                        msg = data.msg;
                        if(data.type==404){
                            deferred.reject();
                            $("#" + file.id).find(".state").text(data.msg);
                        }else if (data.type == 0) {
                            deferred.reject();
                            $("#" + file.id).find(".state").text("文件已上传");
                        } else if (data.type == 1) {
                            if (data.chunk) {
                                deferred.resolve();
                            }
                        } else {
                            deferred.resolve();
                        }

                    },
                    error: function () {
                        deferred.resolve();
                    }
                })
                //deferred.resolve();
                return deferred.promise();
            },
            "beforeSend": function (block) {
                var deferred = WebUploader.Deferred();
                var curChunk = block.chunk;
                var totalChunk = block.chunks;
                console.log(chunkObj)
                if (chunkObj.type == "1") {
                    if (curChunk < chunkObj.chunk) {
                        deferred.reject();
                    } else {
                        deferred.resolve();
                    }
                } else {
                    deferred.resolve();
                }
                return deferred.promise();
            }
        });
        var uploader = WebUploader.create({
            // 选完文件后，是否自动上传。
            auto: false,
            // swf文件路径
            swf: uploadswf,
            // 文件接收服务端。
            server: server_url,
            // 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,//开始分片上传
            chunkSize:1 * 1024 * 1024,//每一片的大小
            threads: 1,
            formData: {
            },

            // 不压缩image, 默认如果是jpeg，文件上传前会压缩一把再上传！
            resize: false
        });

        // 当有文件被添加进队列的时候
        uploader.on('fileQueued', function (file) {

            $list.append('<div id="' + file.id + '" class="item">' +
                '<div class="item-file"><div class="fileType-logo"></div>' +
                '<div class="fileMes"><h4 class="info">' + file.name + '</h4>' +
                '<p class="state">等待上传...</p>' +
                '</div></div></div>');

        });
        // 文件上传过程中创建进度条实时显示。
        uploader.on('uploadProgress', function (file, percentage) {
            var $li = $('#' + file.id),
                $percent = $li.find('.progress .progress-bar');
            // 避免重复创建
            if (!$percent.length) {
                $percent = $('<div class="progress progress-striped active">' +
                    '<div class="progress-bar" role="progressbar" style="width: 0%">' +
                    '</div>' +
                    '</div>').appendTo($li).find('.progress-bar');
            }
            $li.find('p.state').text('上传中');
            $percent.css('width', percentage * 100 + '%');
        });
        uploader.on("uploadBeforeSend", function (obj, data, headers) {
            var file = obj.cuted.file;


            data.test = 1;
            data.fileMd5 = $.md5(file.name + file.size + file.ext);


        })
        // 文件上传成功，给item添加成功class, 用样式标记上传成功。
        uploader.on('uploadSuccess', function (file, response) {
            if(response.status==299){
                $('#' + file.id).find('p.state').text('文件已存在');
            }else{
                $('#' + file.id).find('p.state').text('已上传');
            }

        });
        // 文件上传失败，显示上传出错。
        uploader.on('uploadError', function (file) {
            $('#' + file.id).find('p.state').text(msg);
        });
        // 完成上传完了，成功或者失败，先删除进度条。
        uploader.on('uploadComplete', function (file) {
            $('#' + file.id).find('.progress').fadeOut();
        });
        //所有文件上传完毕
        uploader.on("uploadFinished", function () {
            //提交表单
        });
        //开始上传
        $("#ctlBtn").click(function () {
            uploader.upload();

        });
    });

</script>

php请求后端

use app\index\controller\Upload;
public function uploadVedio()
{
    $model =new Upload();
    $res = $model->doUpload();
    $model->ajaxReturn($res);

}

封装上传类

<?php
namespace app\index\controller;
use think\Controller;

/**
 * 大文件分片上传
 */
class Upload extends Controller
{
    
    
    private $filepath = 'uploads/'; //上传目录
    private $blobNum; //第几个文件块
    private $totalBlobNum; //文件块总数
    private $fileName; //文件名
    #允许上传的文件
    private $allowExtension = ['mp4','avi','wmv'];
    #文件后缀
    private $fileExtension ='';
    #当前块内容
    private $nowFile = '';
    #文件大小
    private $totalSize = 0;
    #文件总大小只允许1G
    private $allowFileSize = 0;
    #文件md5  前端传过来的   用于创建临时文件夹  上传完后删除
    private $fileMd5='';

    public function __construct($savePath =''){
        $postData = $_POST;
        #测试断点上传
        if(isset($postData['test'])){
            sleep(1);
        }
        if($savePath){
            $this->filepath = $this->filepath.$savePath;
        }
        #    #文件名称
      #  var_dump($postData);
        $postData['name'] =isset($postData['name'])?$postData['name']:'';
        $this->fileName =$postData['name'];
        if($this->isHaveFile()){
            $this->ajaxReturn(['status'=>299,'msg'=>'文件已存在！']);
        }

        $this->fileMd5 =$postData['fileMd5'];

        #允许文件的大小  1G
        $this->allowFileSize =(1*1024*1024*1024);

        if((int)$postData['size']>$this->allowFileSize){
            $this->ajaxReturn(['status'=>204,'msg'=>"文件大小超1G限制！"]);
        }
        #文件大小
        $this->totalSize=$postData['size'];
        $postData['chunks']=isset($postData['chunks'])?(int)$postData['chunks']:1;
        $postData['chunk']=isset($postData['chunk'])?(int)$postData['chunk']:0;
        if(!(int)$postData['chunks']){
            $this->ajaxReturn(['status'=>208,'msg'=>'chunks参数错误']);
        }

        #当前块
        $this->blobNum =$postData['chunk']+1;
        #总共块
        $this->totalBlobNum =$postData['chunks'];

        #获取后缀
        $fileExtension =explode(".",basename( $this->fileName));
        $this->fileExtension=array_pop($fileExtension);
        #检测后缀是否在允许范围
        $this->checkFileExtension();
        $this->nowFile =  $_FILES['file'];
        if( $this->nowFile['error'] > 0) {
            $msg['status'] = 502;
            $msg['msg'] = "文件错误！";
            $this->ajaxReturn($msg);
        }

    }
    public function doUpload(){
        #临时文件移动到指定目录下
        $res = $this->moveFile();
        if($res['status']==999){
            return $this->fileMerge();
        }else{
            return $res;
        }
    }

    #创建md5  文件名
    public function createFileName(){
        return $this->filepath.$this->fileName;
    }

    #检测文件是否重复
    public function isHaveFile(){
        if(file_exists($this->filepath.$this->fileName)){
            return true;
        }
        return false;
    }
    #文件合并
    public function fileMerge(){
        if ($this->blobNum == $this->totalBlobNum) {
            $fileName = $this->createFileName();
            @unlink($fileName);
            #删除旧文件
            #文件合并  文件名以
            $handle=fopen($fileName,"a+");
            for($i=1; $i<= $this->totalBlobNum; $i++){
                #当前分片数
                $this->blobNum = $i;
                #吧每个块的文件追加到 上传的文件中
                fwrite($handle,file_get_contents($this->createBlockFileName()));
            }
            fclose($handle);
            #删除分片
            for($i=1; $i<= $this->totalBlobNum; $i++){
                $this->blobNum = $i;
                @unlink($this->createBlockFileName());
            }
            #删除临时目录
            @rmdir($this->filepath.$this->fileMd5);
            if(filesize($fileName) == $this->totalSize){
                $msg['status'] = 200;
                $msg['msg'] = '上传成功！';
                $msg['size'] = $this->totalSize;
                $msg['filename'] = "http://".$_SERVER['HTTP_HOST']."/".$this->createFileName();
                $msg['name'] = $this->fileName;
            }else{
                $msg['status'] = 501;
                $msg['msg'] = '上传文件大小和总大小有误！';
                @unlink($this->createFileName());
            }
            return $msg;
            # $this->ajaxReturn($msg);
        }
    }
    #检测上传类型
    public function checkFileExtension(){
        if(!in_array(strtolower($this->fileExtension),$this->allowExtension)){
            $this->ajaxReturn(['status'=>203,'msg'=>"文件类型不允许"]);
        }
    }
    #将临时文件移动到指定目录
    public function moveFile(){
        try{
            #每个块的文件名 以文件名的MD5作为命名
            $filename=$this->createBlockFileName();
            #分片文件写入
            $handle=fopen($filename,"w+");
            fwrite($handle,file_get_contents($this->nowFile ['tmp_name']));
            fclose($handle);
            #不是最后一块就返回当前信息   是最后一块往下执行合并操作
            if($this->blobNum != $this->totalBlobNum) {
                $msg['status'] = 201;
                $msg['msg'] = "上传成功！";
                $msg['blobNum'] = $this->blobNum;
                return $msg;
                #$this->ajaxReturn($msg);
            }else{
                $msg['status'] = 999;
                $msg['msg'] = "上传成功！";
                $msg['blobNum'] = $this->blobNum;
                return $msg;
            }
        }catch (Exception $e){
            $msg['status'] = 501;
            $msg['error'] = $e->getMessage();
            return $msg;
            #$this->ajaxReturn($msg);
        }
    }
    #创建分片文件名
    public function createBlockFileName(){
        $dirName = $this->filepath.$this->fileMd5."/";
        if (!is_dir($dirName) ) {
            @mkdir($dirName, 0700);
        };
        return $dirName.$this->blobNum.".part";
    }

    #json格式放回处理
    public function ajaxReturn($msg){
        exit(json_encode($msg));
    }
}