php实现大文件断点续传下载实例

php实现大文件断点续传下载实例，看完你就知道超过100M以上的大文件如何断点传输了，这个功能还是比较经典实用的，毕竟大文件上传功能经常用得到。

 require_once('download.class.php');
 date_default_timezone_set('Asia/Shanghai');
 error_reporting(E_STRICT); 

 function errorHandler($errno, $errstr, $errfile, $errline) {
     echo '<p>error:', $errstr, '</p>';
     exit();
 } 

 set_error_handler('errorHandler');
 define('IS_DEBUG', true); 

 $filePath = 'test.zip';
 $mimeType = 'audio/x-matroska';
 $range = isset($_SERVER['HTTP_RANGE']) ? $_SERVER['HTTP_RANGE'] : null;
 if (IS_DEBUG) {
 //    $range = "bytes=1000-1999\n2000";
 //    $range = "bytes=1000-1999,2000";
 //    $range = "bytes=1000-1999,-2000";
 //    $range = "bytes=1000-1999,2000-2999";
 }
 set_time_limit(0);
 $transfer = new Transfer($filePath, $mimeType, $range);
 if (IS_DEBUG) {
     $transfer->setIsLog(true);
 }
 $transfer->send();

download.class.php

 /**
  * 文件传输，支持断点续传。
  * 2g以上超大文件也有效
  * @author MoXie
  */
 class Transfer { 

     /**
      * 缓冲单元
      */
     const BUFF_SIZE = 5120; // 1024 * 5 

     /**
      * 文件地址
      * @var <String>
      */ 

     private $filePath; 

     /**
      * 文件大小
      * @var <String> Php超大数字 字符串形式描述
      */
     private $fileSize; 

     /**
      * 文件类型
      * @var <String>
      */
     private $mimeType; 

     /**
      * 请求区域（范围）
      * @var <String>
      */
     private $range; 

     /**
      * 是否写入日志
      * @var <Boolean>
      */
     private $isLog = false; 

     /**
      *
      * @param <String> $filePath 文件路径
      * @param <String> $mimeType  文件类型
      * @param <String> $range 请求区域（范围）
      */
     function __construct($filePath, $mimeType = null, $range = null) {
         $this->filePath = $filePath;
         $this->fileSize = sprintf('%u', filesize($filePath));
         $this->mimeType = ($mimeType != null) ? $mimeType : "application/octet-stream"; //  bin
         $this->range = trim($range);
     } 

     /**
      *  获取文件区域
      * @return <Map> {'start':long,'end':long} or null
      */
     private function getRange() {
         /**
          *  Range: bytes=-128
          *  Range: bytes=-128
          *  Range: bytes=28-175,382-399,510-541,644-744,977-980
          *  Range: bytes=28-175\n380
          *  type 1
          *  RANGE: bytes=1000-9999
          *  RANGE: bytes=2000-9999
          *  type 2
          *  RANGE: bytes=1000-1999
          *  RANGE: bytes=2000-2999
          *  RANGE: bytes=3000-3999
          */
         if (!empty($this->range)) {
             $range = preg_replace('/[\s|,].*/', '', $this->range);
             $range = explode('-', substr($range, 6));
             if (count($range) < 2) {
                 $range[1] = $this->fileSize; // Range: bytes=-100
             }
             $range = array_combine(array('start', 'end'), $range);
             if (empty($range['start'])) {
                 $range['start'] = 0;
             }
             if (!isset($range['end']) || empty($range['end'])) {
                 $range['end'] = $this->fileSize;
             }
             return $range;
         }
         return null;
     } 

     /**
      * 向客户端发送文件
      */
     public function send() {
         $fileHande = fopen($this->filePath, 'rb');
         if ($fileHande) {
             // setting
             ob_end_clean(); // clean cache
             ob_start();
             ini_set('output_buffering', 'Off');
             ini_set('zlib.output_compression', 'Off');
             $magicQuotes = get_magic_quotes_gpc();
 //            set_magic_quotes_runtime(0);
             // init
             $lastModified = gmdate('D, d M Y H:i:s', filemtime($this->filePath)) . ' GMT';
             $etag = sprintf('w/"%s:%s"', md5($lastModified), $this->fileSize);
             $ranges = $this->getRange();
             // headers
             header(sprintf('Last-Modified: %s', $lastModified));
             header(sprintf('ETag: %s', $etag));
             header(sprintf('Content-Type: %s', $this->mimeType));
             $disposition = 'attachment';
             if (strpos($this->mimeType, 'image/') !== FALSE) {
                 $disposition = 'inline';
             }
             header(sprintf('Content-Disposition: %s; filename="%s"', $disposition, basename($this->filePath))); 

             if ($ranges != null) {
                 if ($this->isLog) {
                     $this->log(json_encode($ranges) . ' ' . $_SERVER['HTTP_RANGE']);
                 }
                 header('HTTP/1.1 206 Partial Content');
                 header('Accept-Ranges: bytes');
                 header(sprintf('Content-Length: %u', $ranges['end'] - $ranges['start']));
                 header(sprintf('Content-Range: bytes %s-%s/%s', $ranges['start'], $ranges['end'], $this->fileSize));
                 //
                 fseek($fileHande, sprintf('%u', $ranges['start']));
             } else {
                 header("HTTP/1.1 200 OK");
                 header(sprintf('Content-Length: %s', $this->fileSize));
             }
             // read file
             $lastSize = 0;
             while (!feof($fileHande) && !connection_aborted()) {
                 $lastSize = sprintf("%u", bcsub($this->fileSize, sprintf("%u", ftell($fileHande))));
                 if (bccomp($lastSize, self::BUFF_SIZE) > 0) {
                     $lastSize = self::BUFF_SIZE;
                 }
                 echo fread($fileHande, $lastSize);
                 ob_flush();
                 flush();
             }
             set_magic_quotes_runtime($magicQuotes);
             ob_end_flush();
         }
         if ($fileHande != null) {
             fclose($fileHande);
         }
     } 

     /**
      * 设置记录
      * @param <Boolean> $isLog  是否记录
      */
     public function setIsLog($isLog = true) {
         $this->isLog = $isLog;
     } 

     /**
      * 记录
      * @param <String> $msg  记录信息
      */
     private function log($msg) {
         try {
             $handle = fopen('transfer_log.txt', 'a');
             fwrite($handle, sprintf('%s : %s' . PHP_EOL, date('Y-m-d H:i:s'), $msg));
             fclose($handle);
         } catch (Exception $e) {
             // null;
         }
     } 

 }

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