PHP uses range protocol to implement breakpoint resume upload code example of output file_PHP tutorial

Uses of range protocol: Generally used when resuming downloads, but the actual users are very large. For example, if your web server needs to output a large file, then range can be used to output it in segments. Relieve stress. At the same time, it can buffer downloads when providing services such as music videos. If the user closes it midway, network bandwidth can be saved.

<&#63;php

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

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

// 后缀
$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.*]&#63;/i', $_SERVER ['HTTP_RANGE'], $matches )) {
		// 读取文件，起始节点
		$begin = intval ( $matches [1] );

		// 读取文件，结束节点
		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;

// 定位指针
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 protocol official document: http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

http://www.bkjia.com/PHPjc/824622.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/824622.htmlTechArticleRange protocol usage: Generally used when resuming downloads, but the actual users are very large, such as you Your web server needs to output a large file, so you can use range to output it in segments to ease...