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;
  }
 }
}

总结

以上所述是小编给大家介绍的php实现大文件断点续传下载实例代码,希望对大家有所帮助,如果大家有任何疑问欢迎给我留言,小编会及时回复大家的!

01-23 14:55