php断点续传之文件上传与文件下载

<?php/** php下载类,支持断点续传* ??Date: ??2013-06-30* ??Author: fdipzone* ??Ver: ???1.0** ??Func:* ??public ?download: 下载文件* ??public ?setSpeed: 设置下载速度* ??private getRange: 获取header中Range*/class FileDownload{ // class start ???private $_speed = 512; ??// 下载速度 ???/** 下载 ???* @param String ?$file ??要下载的文件路径 ???* @param String ?$name ??文件名称,为空则与下载的文件名称一样 ???* @param boolean $reload 是否开启断点续传 ???*/ ???public function download($file, $name=‘‘, $reload=false){ ???????if(file_exists($file)){ ???????????if($name==‘‘){ ???????????????$name = basename($file); ???????????} ???????????$fp = fopen($file, ‘rb‘); ???????????$file_size = filesize($file); ???????????$ranges = $this->getRange($file_size); ???????????header(‘cache-control:public‘); ???????????header(‘content-type:application/octet-stream‘); ???????????header(‘content-disposition:attachment; filename=‘.$name); ???????????if($reload && $ranges!=null){ // 使用续传 ???????????????header(‘HTTP/1.1 206 Partial Content‘); ???????????????header(‘Accept-Ranges:bytes‘); ???????????????????????????????// 剩余长度 ???????????????header(sprintf(‘content-length:%u‘,$ranges[‘end‘]-$ranges[‘start‘])); ???????????????????????????????// range信息 ???????????????header(sprintf(‘content-range:bytes %s-%s/%s‘, $ranges[‘start‘], $ranges[‘end‘], $file_size)); ???????????????????????????????// fp指针跳到断点位置 ???????????????fseek($fp, sprintf(‘%u‘, $ranges[‘start‘])); ???????????}else{ ???????????????header(‘HTTP/1.1 200 OK‘); ???????????????header(‘content-length:‘.$file_size); ???????????} ???????????while(!feof($fp)){ ???????????????echo fread($fp, round($this->_speed*1024,0)); ???????????????ob_flush(); ???????????????//sleep(1); // 用于测试,减慢下载速度 ???????????} ???????????($fp!=null) && fclose($fp); ???????}else{ ???????????return ‘‘; ???????} ???} ???/** 设置下载速度 ???* @param int $speed ???*/ ???public function setSpeed($speed){ ???????if(is_numeric($speed) && $speed>16 && $speed<4096){ ???????????$this->_speed = $speed; ???????} ???} ???/** 获取header range信息 ???* @param ?int ??$file_size 文件大小 ???* @return Array ???*/ ???private function getRange($file_size){ ???????if(isset($_SERVER[‘HTTP_RANGE‘]) && !empty($_SERVER[‘HTTP_RANGE‘])){ ???????????$range = $_SERVER[‘HTTP_RANGE‘]; ???????????$range = preg_replace(‘/[\s|,].*/‘, ‘‘, $range); ???????????$range = explode(‘-‘, substr($range, 6)); ???????????if(count($range)<2){ ???????????????$range[1] = $file_size; ???????????} ???????????$range = array_combine(array(‘start‘,‘end‘), $range); ???????????if(empty($range[‘start‘])){ ???????????????$range[‘start‘] = 0; ???????????} ???????????if(empty($range[‘end‘])){ ???????????????$range[‘end‘] = $file_size; ???????????} ???????????return $range; ???????} ???????return null; ???}} // class end?>