远程流媒体文件大于1GB

Question

我有一个PHP应用程序，它从远程URL流式传输文件。

对于小文件，它可以正常工作。但是，当我尝试下载大于1GB的文件时，它只会读取第一个1GB，然后停止。

fread()始终返回empty，feof()为true。
该文件大于1GB，数据仍然未读。

远程使用fread()的 official documentation 目前尚不清楚;我不明白。

我在https://github.com/nextcloud/server/blob/master/lib/private/Files/Stream/Encryption.php#L457使用NextCloud中的代码 当S3作为主存储时，它上传＆amp;通过远程网址下载。但是这个功能并不总能返回完整的数据。

Answer 1

通过http

下载大文件

<?php
function DownloadFile($file){

   //First, see if the file exists
   if (!is_file($file)) { die("<b>404 File not found!</b>"); }

   //Gather relevent info about file
   $len = filesize($file);
   $filename = basename($file);
   $file_extension = strtolower(substr(strrchr($filename,"."),1));

   //This will set the Content-Type to the appropriate setting for the file
   switch( $file_extension ) {
     case "exe": $ctype="application/octet-stream"; break;
     case "zip": $ctype="application/zip"; break;
     case "mp3": $ctype="audio/mpeg"; break;
     case "mpg":$ctype="video/mpeg"; break;
     case "avi": $ctype="video/x-msvideo"; break;

     //The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)
     case "php":
     case "htm":
     case "html":
     case "txt": die("<b>Cannot be used for ". $file_extension ." files!</b>"); break;

     default: $ctype="application/force-download";
   }

   //Begin writing headers
   header("Pragma: public");
   header("Expires: 0");
   header("Cache-Control:");
   header("Cache-Control: public"); 
   header("Content-Description: File Transfer");

   //Use the switch-generated Content-Type
   header("Content-Type: $ctype");
$filespaces = str_replace("_", " ", $filename);

//if your filename contains underscores, you can replace them with spaces
  $header='Content-Disposition: attachment; filename='.$filespaces.';';
   header($header );
   header("Content-Transfer-Encoding: binary");

      $size=filesize($file);
    //check if http_range is sent by browser (or download manager)
       if(isset($_ENV['HTTP_RANGE'])) {
    list($a, $range)=explode("=",$_ENV['HTTP_RANGE']);
    //if yes, download missing part
    str_replace($range, "-", $range);
    $size2=$size-1;
    header("Content-Range: $range$size2/$size");
    $new_length=$size2-$range;
    header("Content-Length: $new_length");
    /if not, download whole file
    } else {
    $size2=$size-1;
    header("Content-Range: bytes 0-$size2/$size");
    header("Content-Length: ".$size2);
    }
    //open the file
    $fp=fopen("$file","r");
    //seek to start of missing part
    fseek($fp,$range);
    //start buffered download
    while(!feof($fp))
    {
    //reset time limit for big files
    set_time_limit();
    print(fread($fp,1024*8));
    flush();
    }
    fclose($fp); 

   exit;

} 
?>

用法：

<?php
    DownloadFile("somefile.mp3");
?>