使用PHPstream式传输大文件

我有一个200MB的文件，我想通过下载给用户。 但是，由于我们希望用户只下载一次这个文件，我们正在这样做：

echo file_get_contents('http://some.secret.location.com/secretfolder/the_file.tar.gz'); 

强制下载。 但是，这意味着整个文件必须加载到内存中，这通常不起作用。 我们怎样才能把这个文件stream式传输给他们，大概是每块大小？

Answer 1

试试像这样（来源http://teddy.fr/2007/11/28/how-serve-big-files-through-php/ ）：

 <?php define('CHUNK_SIZE', 1024*1024); // Size (in bytes) of tiles chunk // Read a file and display its content chunk by chunk function readfile_chunked($filename, $retbytes = TRUE) { $buffer = ''; $cnt = 0; $handle = fopen($filename, 'rb'); if ($handle === false) { return false; } while (!feof($handle)) { $buffer = fread($handle, CHUNK_SIZE); echo $buffer; ob_flush(); flush(); if ($retbytes) { $cnt += strlen($buffer); } } $status = fclose($handle); if ($retbytes && $status) { return $cnt; // return num. bytes delivered like readfile() does. } return $status; } // Here goes your code for checking that the user is logged in // ... // ... if ($logged_in) { $filename = 'path/to/your/file'; $mimetype = 'mime/type'; header('Content-Type: '.$mimetype ); readfile_chunked($filename); } else { echo 'Tabatha says you haven\'t paid.'; } ?> 

Answer 2

使用fpassthru() 。 顾名思义，它不会在发送之前将整个文件读入内存，而是直接将其输出到客户端。

从手册中的示例修改：

 <?php // the file you want to send $path = "path/to/file"; // the file name of the download, change this if needed $public_name = basename($path); // get the file's mime type to send the correct content type header $finfo = finfo_open(FILEINFO_MIME_TYPE); $mime_type = finfo_file($finfo, $path); // send the headers header("Content-Disposition: attachment; filename=$public_name;"); header("Content-Type: $mime_type"); header('Content-Length: ' . filesize($path)); // stream the file $fp = fopen($path, 'rb'); fpassthru($fp); exit; 

如果您宁愿将内容直接传输到浏览器而不是下载（如果浏览器支持内容types，例如video，audio，pdf等），则删除Content-Disposition标头。

Answer 3

看看fsockopen()的手册页中的例子：

 $fp = fsockopen("www.example.com", 80, $errno, $errstr, 30); if (!$fp) { echo "$errstr ($errno)<br />\n"; } else { $out = "GET / HTTP/1.1\r\n"; $out .= "Host: www.example.com\r\n"; $out .= "Connection: Close\r\n\r\n"; fwrite($fp, $out); while (!feof($fp)) { echo fgets($fp, 128); } fclose($fp); } 

这将连接到www.example.com ，发送一个请求，然后以128字节块回显响应。 你可能想要使它超过128个字节。

Answer 4

我在http://codesamplez.com/programming/php-html5-video-streaming-tutorial上find了这个方法;

这对我来说非常好

  <?php class VideoStream { private $path = ""; private $stream = ""; private $buffer = 102400; private $start = -1; private $end = -1; private $size = 0; function __construct($filePath) { $this->path = $filePath; } /** * Open stream */ private function open() { if (!($this->stream = fopen($this->path, 'rb'))) { die('Could not open stream for reading'); } } /** * Set proper header to serve the video content */ private function setHeader() { ob_get_clean(); header("Content-Type: video/mp4"); header("Cache-Control: max-age=2592000, public"); header("Expires: ".gmdate('D, d MYH:i:s', time()+2592000) . ' GMT'); header("Last-Modified: ".gmdate('D, d MYH:i:s', @filemtime($this->path)) . ' GMT' ); $this->start = 0; $this->size = filesize($this->path); $this->end = $this->size - 1; header("Accept-Ranges: 0-".$this->end); if (isset($_SERVER['HTTP_RANGE'])) { $c_start = $this->start; $c_end = $this->end; list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2); if (strpos($range, ',') !== false) { header('HTTP/1.1 416 Requested Range Not Satisfiable'); header("Content-Range: bytes $this->start-$this->end/$this->size"); exit; } if ($range == '-') { $c_start = $this->size - substr($range, 1); }else{ $range = explode('-', $range); $c_start = $range[0]; $c_end = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $c_end; } $c_end = ($c_end > $this->end) ? $this->end : $c_end; if ($c_start > $c_end || $c_start > $this->size - 1 || $c_end >= $this->size) { header('HTTP/1.1 416 Requested Range Not Satisfiable'); header("Content-Range: bytes $this->start-$this->end/$this->size"); exit; } $this->start = $c_start; $this->end = $c_end; $length = $this->end - $this->start + 1; fseek($this->stream, $this->start); header('HTTP/1.1 206 Partial Content'); header("Content-Length: ".$length); header("Content-Range: bytes $this->start-$this->end/".$this->size); } else { header("Content-Length: ".$this->size); } } /** * close curretly opened stream */ private function end() { fclose($this->stream); exit; } /** * perform the streaming of calculated range */ private function stream() { $i = $this->start; set_time_limit(0); while(!feof($this->stream) && $i <= $this->end) { $bytesToRead = $this->buffer; if(($i+$bytesToRead) > $this->end) { $bytesToRead = $this->end - $i + 1; } $data = fread($this->stream, $bytesToRead); echo $data; flush(); $i += $bytesToRead; } } /** * Start streaming video content */ function start() { $this->open(); $this->setHeader(); $this->stream(); $this->end(); } } 

要使用这个类，你将不得不编写简单的代码，如下所示：

 $stream = new VideoStream($filePath); $stream->start();