1 require_once('download.class.php'); 
 2 date_default_timezone_set('Asia/Shanghai'); 
 3 error_reporting(E_STRICT); 
 4  
 5 function errorHandler($errno, $errstr, $errfile, $errline) { 
 6     echo '<p>error:', $errstr, '</p>'; 
 7     exit(); 
 8 } 
 9  
10 set_error_handler('errorHandler'); 
11 define('IS_DEBUG', true); 
12  
13 $filePath = 'test.zip'; 
14 $mimeType = 'audio/x-matroska'; 
15 $range = isset($_SERVER['HTTP_RANGE']) ? $_SERVER['HTTP_RANGE'] : null; 
16 if (IS_DEBUG) { 
17 //    $range = "bytes=1000-1999\n2000"; 
18 //    $range = "bytes=1000-1999,2000";  
19 //    $range = "bytes=1000-1999,-2000";  
20 //    $range = "bytes=1000-1999,2000-2999";  
21 } 
22 set_time_limit(0); 
23 $transfer = new Transfer($filePath, $mimeType, $range); 
24 if (IS_DEBUG) { 
25     $transfer->setIsLog(true); 
26 } 
27 $transfer->send();

  1 /** 
  2  * 文件传输，支持断点续传。 
  3  * 2g以上超大文件也有效 
  4  * @author MoXie 
  5  */ 
  6 class Transfer { 
  7  
  8     /** 
  9      * 缓冲单元 
 10      */ 
 11     const BUFF_SIZE = 5120; // 1024 * 5 
 12  
 13     /** 
 14      * 文件地址 
 15      * @var <String> 
 16      */ 
 17  
 18     private $filePath; 
 19  
 20     /** 
 21      * 文件大小 
 22      * @var <String> Php超大数字 字符串形式描述 
 23      */ 
 24     private $fileSize; 
 25  
 26     /** 
 27      * 文件类型 
 28      * @var <String> 
 29      */ 
 30     private $mimeType; 
 31  
 32     /** 
 33      * 请求区域（范围） 
 34      * @var <String> 
 35      */ 
 36     private $range; 
 37  
 38     /** 
 39      * 是否写入日志 
 40      * @var <Boolean> 
 41      */ 
 42     private $isLog = false; 
 43  
 44     /** 
 45      * 
 46      * @param <String> $filePath 文件路径 
 47      * @param <String> $mimeType  文件类型 
 48      * @param <String> $range 请求区域（范围） 
 49      */ 
 50     function __construct($filePath, $mimeType = null, $range = null) { 
 51         $this->filePath = $filePath; 
 52         $this->fileSize = sprintf('%u', filesize($filePath)); 
 53         $this->mimeType = ($mimeType != null) ? $mimeType : "application/octet-stream"; //  bin 
 54         $this->range = trim($range); 
 55     } 
 56  
 57     /** 
 58      *  获取文件区域 
 59      * @return <Map> {'start':long,'end':long} or null 
 60      */ 
 61     private function getRange() { 
 62         /** 
 63          *  Range: bytes=-128 
 64          *  Range: bytes=-128 
 65          *  Range: bytes=28-175,382-399,510-541,644-744,977-980 
 66          *  Range: bytes=28-175\n380 
 67          *  type 1 
 68          *  RANGE: bytes=1000-9999 
 69          *  RANGE: bytes=2000-9999 
 70          *  type 2 
 71          *  RANGE: bytes=1000-1999 
 72          *  RANGE: bytes=2000-2999 
 73          *  RANGE: bytes=3000-3999 
 74          */ 
 75         if (!empty($this->range)) { 
 76             $range = preg_replace('/[\s|,].*/', '', $this->range); 
 77             $range = explode('-', substr($range, 6)); 
 78             if (count($range) < 2) { 
 79                 $range[1] = $this->fileSize; // Range: bytes=-100 
 80             } 
 81             $range = array_combine(array('start', 'end'), $range); 
 82             if (empty($range['start'])) { 
 83                 $range['start'] = 0; 
 84             } 
 85             if (!isset($range['end']) || empty($range['end'])) { 
 86                 $range['end'] = $this->fileSize; 
 87             } 
 88             return $range; 
 89         } 
 90         return null; 
 91     } 
 92  
 93     /** 
 94      * 向客户端发送文件 
 95      */ 
 96     public function send() { 
 97         $fileHande = fopen($this->filePath, 'rb'); 
 98         if ($fileHande) { 
 99             // setting 
100             ob_end_clean(); // clean cache 
101             ob_start(); 
102             ini_set('output_buffering', 'Off'); 
103             ini_set('zlib.output_compression', 'Off'); 
104             $magicQuotes = get_magic_quotes_gpc(); 
105 //            set_magic_quotes_runtime(0); 
106             // init 
107             $lastModified = gmdate('D, d M Y H:i:s', filemtime($this->filePath)) . ' GMT'; 
108             $etag = sprintf('w/"%s:%s"', md5($lastModified), $this->fileSize); 
109             $ranges = $this->getRange(); 
110             // headers 
111             header(sprintf('Last-Modified: %s', $lastModified)); 
112             header(sprintf('ETag: %s', $etag)); 
113             header(sprintf('Content-Type: %s', $this->mimeType)); 
114             $disposition = 'attachment'; 
115             if (strpos($this->mimeType, 'image/') !== FALSE) { 
116                 $disposition = 'inline'; 
117             } 
118             header(sprintf('Content-Disposition: %s; filename="%s"', $disposition, basename($this->filePath))); 
119  
120             if ($ranges != null) { 
121                 if ($this->isLog) { 
122                     $this->log(json_encode($ranges) . ' ' . $_SERVER['HTTP_RANGE']); 
123                 } 
124                 header('HTTP/1.1 206 Partial Content'); 
125                 header('Accept-Ranges: bytes'); 
126                 header(sprintf('Content-Length: %u', $ranges['end'] - $ranges['start'])); 
127                 header(sprintf('Content-Range: bytes %s-%s/%s', $ranges['start'], $ranges['end'], $this->fileSize)); 
128                 // 
129                 fseek($fileHande, sprintf('%u', $ranges['start'])); 
130             } else { 
131                 header("HTTP/1.1 200 OK"); 
132                 header(sprintf('Content-Length: %s', $this->fileSize)); 
133             } 
134             // read file 
135             $lastSize = 0; 
136             while (!feof($fileHande) && !connection_aborted()) { 
137                 $lastSize = sprintf("%u", bcsub($this->fileSize, sprintf("%u", ftell($fileHande)))); 
138                 if (bccomp($lastSize, self::BUFF_SIZE) > 0) { 
139                     $lastSize = self::BUFF_SIZE; 
140                 } 
141                 echo fread($fileHande, $lastSize); 
142                 ob_flush(); 
143                 flush(); 
144             } 
145             set_magic_quotes_runtime($magicQuotes); 
146             ob_end_flush(); 
147         } 
148         if ($fileHande != null) { 
149             fclose($fileHande); 
150         } 
151     } 
152  
153     /** 
154      * 设置记录 
155      * @param <Boolean> $isLog  是否记录 
156      */ 
157     public function setIsLog($isLog = true) { 
158         $this->isLog = $isLog; 
159     } 
160  
161     /** 
162      * 记录 
163      * @param <String> $msg  记录信息 
164      */ 
165     private function log($msg) { 
166         try { 
167             $handle = fopen('transfer_log.txt', 'a'); 
168             fwrite($handle, sprintf('%s : %s' . PHP_EOL, date('Y-m-d H:i:s'), $msg)); 
169             fclose($handle); 
170         } catch (Exception $e) { 
171             // null; 
172         } 
173     } 
174  
175 }