PHP使用range協議實現輸出文件斷點續傳代碼實例

range協議用途：一般是用在斷點續傳的時候，但是實際的用戶很大，例如你的web server需要輸出一個大文件，那麼用range可以分段輸出，緩解壓力。同時在提供音樂視頻等服務時可以緩沖下載，如果用戶中途關閉，可以節約網絡帶寬。

<?php

// 文件名
$filename = $_GET ['filename'];

// 文件路徑
$location = 'media/' . $filename;

// 後綴
$extension = substr ( strrchr ( $filename, '.' ), 1 );

if ($extension == "mp3") {
	$mimeType = "audio/mpeg";
} else if ($extension == "ogg") {
	$mimeType = "audio/ogg";
}

if (! file_exists ( $location )) {
	header ( "HTTP/1.1 404 Not Found" );
	return;
}

$size = filesize ( $location );
$time = date ( 'r', filemtime ( $location ) );

$fm = @fopen ( $location, 'rb' );
if (! $fm) {
	header ( "HTTP/1.1 505 Internal server error" );
	return;
}

$begin = 0;
$end = $size - 1;

if (isset ( $_SERVER ['HTTP_RANGE'] )) {
	if (preg_match ( '/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER ['HTTP_RANGE'], $matches )) {
		// 讀取文件，起始節點
		$begin = intval ( $matches [1] );

		// 讀取文件，結束節點
		if (! empty ( $matches [2] )) {
			$end = intval ( $matches [2] );
		}
	}
}

if (isset ( $_SERVER ['HTTP_RANGE'] )) {
	header ( 'HTTP/1.1 206 Partial Content' );
} else {
	header ( 'HTTP/1.1 200 OK' );
}

header ( "Content-Type: $mimeType" );
header ( 'Cache-Control: public, must-revalidate, max-age=0' );
header ( 'Pragma: no-cache' );
header ( 'Accept-Ranges: bytes' );
header ( 'Content-Length:' . (($end - $begin) + 1) );

if (isset ( $_SERVER ['HTTP_RANGE'] )) {
	header ( "Content-Range: bytes $begin-$end/$size" );
}

header ( "Content-Disposition: inline; filename=$filename" );
header ( "Content-Transfer-Encoding: binary" );
header ( "Last-Modified: $time" );

$cur = $begin;

// 定位指針
fseek ( $fm, $begin, 0 );

while ( ! feof ( $fm ) && $cur <= $end && (connection_status () == 0) ) {
	print fread ( $fm, min ( 1024 * 16, ($end - $cur) + 1 ) );
	$cur += 1024 * 16;
}

range協議官方文檔：http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html