html页面范围,HTML5视频和部分范围的HTTP请求

我知道这是一个老问题,但是如果它有帮助你可以尝试我们在代码库中使用的以下“模型”.

class Model_DownloadableFile {

private $full_path;

function __construct($full_path) {

$this->full_path = $full_path;

}

public function get_full_path() {

return $this->full_path;

}

// Function borrowed from (been cleaned up and modified slightly): https://stackoverflow.com/questions/157318/resumable-downloads-when-using-php-to-send-the-file/4451376#4451376

// Allows for resuming paused downloads etc

public function download_file_in_browser() {

// Avoid sending unexpected errors to the client - we should be serving a file,

// we don't want to corrupt the data we send

@error_reporting(0);

// Make sure the files exists, otherwise we are wasting our time

if (!file_exists($this->full_path)) {

header('HTTP/1.1 404 Not Found');

exit;

}

// Get the 'Range' header if one was sent

if (isset($_SERVER['HTTP_RANGE'])) {

$range = $_SERVER['HTTP_RANGE']; // IIS/Some Apache versions

} else if ($apache = apache_request_headers()) { // Try Apache again

$headers = array();

foreach ($apache as $header => $val) {

$headers[strtolower($header)] = $val;

}

if (isset($headers['range'])) {

$range = $headers['range'];

} else {

$range = false; // We can't get the header/there isn't one set

}

} else {

$range = false; // We can't get the header/there isn't one set

}

// Get the data range requested (if any)

$filesize = filesize($this->full_path);

$length = $filesize;

if ($range) {

$partial = true;

list($param, $range) = explode('=', $range);

if (strtolower(trim($param)) != 'bytes') { // Bad request - range unit is not 'bytes'

header("HTTP/1.1 400 Invalid Request");

exit;

}

$range = explode(',', $range);

$range = explode('-', $range[0]); // We only deal with the first requested range

if (count($range) != 2) { // Bad request - 'bytes' parameter is not valid

header("HTTP/1.1 400 Invalid Request");

exit;

}

if ($range[0] === '') { // First number missing, return last $range[1] bytes

$end = $filesize - 1;

$start = $end - intval($range[0]);

} else if ($range[1] === '') { // Second number missing, return from byte $range[0] to end

$start = intval($range[0]);

$end = $filesize - 1;

} else { // Both numbers present, return specific range

$start = intval($range[0]);

$end = intval($range[1]);

if ($end >= $filesize || (!$start && (!$end || $end == ($filesize - 1)))) {

$partial = false;

} // Invalid range/whole file specified, return whole file

}

$length = $end - $start + 1;

} else {

$partial = false; // No range requested

}

// Determine the content type

$finfo = finfo_open(FILEINFO_MIME_TYPE);

$contenttype = finfo_file($finfo, $this->full_path);

finfo_close($finfo);

// Send standard headers

header("Content-Type: $contenttype");

header("Content-Length: $length");

header('Content-Disposition: attachment; filename="' . basename($this->full_path) . '"');

header('Accept-Ranges: bytes');

// if requested, send extra headers and part of file...

if ($partial) {

header('HTTP/1.1 206 Partial Content');

header("Content-Range: bytes $start-$end/$filesize");

if (!$fp = fopen($this->full_path, 'r')) { // Error out if we can't read the file

header("HTTP/1.1 500 Internal Server Error");

exit;

}

if ($start) {

fseek($fp, $start);

}

while ($length) { // Read in blocks of 8KB so we don't chew up memory on the server

$read = ($length > 8192) ? 8192 : $length;

$length -= $read;

print(fread($fp, $read));

}

fclose($fp);

} else {

readfile($this->full_path); // ...otherwise just send the whole file

}

// Exit here to avoid accidentally sending extra content on the end of the file

exit;

}

}

然后你像这样使用它：

(new Model_DownloadableFile('FULL/PATH/TO/FILE'))->download_file_in_browser();

它将处理发送部分文件或完整文件等,并在这个和许多其他情况下很好地适用于我们.希望能帮助到你.