PHP大文件分割上传 PHP分片上传

用户2323866

修改于 2021-07-02 10:36:16

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修改于 2021-07-02 10:36:16

文章被收录于专栏：技术派

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/【要记得博客地址www.isres.com】/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"; }

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'] =/【本文中一些MYSQL版本可能是以前的，MYSQL建议使用5.7以上的版本】/ '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',$_POST['blob_num'],$_POST['total_blob_num'],$_POST['file_name']); //调用方法，返回结果 $upload->apiReturn();

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