How to resume uploading large files with PHP?

get /down.zip http/1.1<br/>accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-<br/>excel, application/msword, application/vnd.ms-powerpoint, */*<br/>accept-language: zh-cn<br/>accept-encoding: gzip, deflate<br/>user-agent: mozilla/4.0 (compatible; msie 5.01; windows nt 5.0)<br/>connection: keep-alive<br/>

HTTP/1.1 200 Ok<br/>content-length=106786028<br/>accept-ranges=bytes<br/>date=mon, 30 apr 2001 12:56:11 gmt<br/>etag=w/"02ca57e173c11:95b"<br/>content-type=application/octet-stream<br/>server=microsoft-iis/5.0<br/>last-modified=mon, 30 apr 2001 12:56:11 gmt<br/>

GET /down.zip HTTP/1.0<br/>User-Agent: NetFox<br/>RANGE: bytes=2000070-<br/>Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2<br/>

Range: bytes=startOffset-targetOffset/sum [表示从startOffset读取，一直读取到targetOffset位置，读取总数为sum直接]<br/> <br/>Range: bytes=startOffset-targetOffset [字节总数也可以去掉]<br/>

HTTP/1.1 206 Partial Content<br/>content-length=106786028<br/>content-range=bytes 2000070-106786027/106786028<br/>date=mon, 30 apr 2001 12:55:20 gmt<br/>etag=w/"02ca57e173c11:95b"<br/>content-type=application/octet-stream<br/>server=microsoft-iis/5.0<br/>last-modified=mon, 30 apr 2001 12:55:20 gmt<br/>

Content-Range=bytes 2000070-106786027/106786028<br/>

HTTP/1.1 206 Partial Content<br/>

/** php下载类,支持断点续传<br/> * download: 下载文件<br/> * setSpeed: 设置下载速度<br/> * getRange: 获取header中Range<br/> */<br/> <br/>class FileDownload{<br/> <br/> /** 下载<br/> * @param String $file 要下载的文件路径<br/> * @param String $name 文件名称,为空则与下载的文件名称一样<br/> * @param boolean $reload 是否开启断点续传<br/> */<br/> public function download($file, $name=&#39;&#39;, $reload=false){<br/> $fp = @fopen($file, &#39;rb&#39;);<br/> if($fp){<br/> if($name==&#39;&#39;){<br/> $name = basename($file);<br/> }<br/> $header_array = get_headers($file, true);<br/> //var_dump($header_array);die;<br/> // 下载本地文件，获取文件大小<br/> if (!$header_array) {<br/> $file_size = filesize($file);<br/> } else {<br/> $file_size = $header_array[&#39;Content-Length&#39;];<br/> }<br/> $ranges = $this->getRange($file_size);<br/> $ua = $_SERVER["HTTP_USER_AGENT"];//判断是什么类型浏览器<br/> header(&#39;cache-control:public&#39;);<br/> header(&#39;content-type:application/octet-stream&#39;); <br/> <br/> $encoded_filename = urlencode($name);<br/> $encoded_filename = str_replace("+", "%20", $encoded_filename);<br/> <br/> //解决下载文件名乱码<br/> if (preg_match("/MSIE/", $ua) || preg_match("/Trident/", $ua) ){ <br/> header(&#39;Content-Disposition: attachment; filename="&#39; .$encoded_filename . &#39;"&#39;);<br/> } else if (preg_match("/Firefox/", $ua)) {<br/> header(&#39;Content-Disposition: attachment; filename*="utf8\&#39;\&#39;&#39; . $name . &#39;"&#39;);<br/> }else if (preg_match("/Chrome/", $ua)) {<br/> header(&#39;Content-Disposition: attachment; filename="&#39; . $encoded_filename . &#39;"&#39;);<br/> } else {<br/> header(&#39;Content-Disposition: attachment; filename="&#39; . $name . &#39;"&#39;);<br/> }<br/> //header(&#39;Content-Disposition: attachment; filename="&#39; . $name . &#39;"&#39;);<br/> <br/> if($reload && $ranges!=null){ // 使用续传<br/> header(&#39;HTTP/1.1 206 Partial Content&#39;);<br/> header(&#39;Accept-Ranges:bytes&#39;);<br/> <br/> // 剩余长度<br/> header(sprintf(&#39;content-length:%u&#39;,$ranges[&#39;end&#39;]-$ranges[&#39;start&#39;]));<br/> <br/> // range信息<br/> header(sprintf(&#39;content-range:bytes %s-%s/%s&#39;, $ranges[&#39;start&#39;], $ranges[&#39;end&#39;], $file_size));<br/> //file_put_contents(&#39;test.log&#39;,sprintf(&#39;content-length:%u&#39;,$ranges[&#39;end&#39;]-$ranges[&#39;start&#39;]),FILE_APPEND);<br/> // fp指针跳到断点位置<br/> fseek($fp, sprintf(&#39;%u&#39;, $ranges[&#39;start&#39;]));<br/> }else{<br/> file_put_contents(&#39;test.log&#39;,&#39;2222&#39;,FILE_APPEND);<br/> header(&#39;HTTP/1.1 200 OK&#39;);<br/> header(&#39;content-length:&#39;.$file_size);<br/> }<br/> <br/> while(!feof($fp)){<br/> //echo fread($fp, round($this->_speed*1024,0));<br/> //echo fread($fp, $file_size);<br/> echo fread($fp, 4096);<br/> ob_flush();<br/> }<br/> <br/> ($fp!=null) && fclose($fp);<br/> }else{<br/> return &#39;&#39;;<br/> }<br/> }<br/> <br/> /** 设置下载速度<br/> * @param int $speed<br/> */<br/> public function setSpeed($speed){<br/> if(is_numeric($speed) && $speed>16 && $speed<4096){<br/> $this->_speed = $speed;<br/> }<br/> }<br/> <br/> /** 获取header range信息<br/> * @param int $file_size 文件大小<br/> * @return Array<br/> */<br/> private function getRange($file_size){<br/> //file_put_contents(&#39;range.log&#39;, json_encode($_SERVER), FILE_APPEND);<br/> if(isset($_SERVER[&#39;HTTP_RANGE&#39;]) && !empty($_SERVER[&#39;HTTP_RANGE&#39;])){<br/> $range = $_SERVER[&#39;HTTP_RANGE&#39;];<br/> $range = preg_replace(&#39;/[\s|,].*/&#39;, &#39;&#39;, $range);<br/> $range = explode(&#39;-&#39;, substr($range, 6));<br/> if(count($range)<2){<br/> $range[1] = $file_size;<br/> }<br/> $range = array_combine(array(&#39;start&#39;,&#39;end&#39;), $range);<br/> if(empty($range[&#39;start&#39;])){<br/> $range[&#39;start&#39;] = 0;<br/> }<br/> if(empty($range[&#39;end&#39;])){<br/> $range[&#39;end&#39;] = $file_size;<br/> }<br/> return $range;<br/> }<br/> return null;<br/> }<br/>}<br/> <br/>$obj = new FileDownload();<br/>$obj->download(&#39;http://down.golaravel.com/laravel/laravel-master.zip&#39;,&#39;&#39;, true);<br/>