【PHP】動画ファイルを出力する方法

<?php
$file = "hoge.mp4";

$file_size = filesize( $file ) ;

header( "Accept-Ranges: bytes" ) ;
//header('Content-type: video/mp4');

$handle = fopen($file, 'rb');
if ($handle === false) {
return false;
}

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

list($toss, $range) = explode('=', $_SERVER['HTTP_RANGE']);
list($range_start, $range_end) = explode('-', $range);

$size = $file_size - 1;
$length = $range_end - $range_start +1; // (rangeは0から始まる数なので)

header('HTTP/1.1 206 Partial Content');
header('Content-type: video/mp4');
header('Content-Length: ' . $length);
header('Content-Range: bytes ' . $range . '/' . $file_size);
header("Etag: \"" . md5( $_SERVER["REQUEST_URI"] ) . $file_size . "\"" );
header("Last-Modified: " . gmdate( "D, d M Y H:i:s", filemtime($file)) . " GMT");
fseek($handle, $range_start);

}else {

// 一回目のリクエスト
// Content-Length のヘッダと、ファイル全体をレスポンス
$content_length = $file_size ;
header('Content-type: video/mp4');
header('Content-Length: ' . $file_size);
header("Etag: \"" . md5( $_SERVER["REQUEST_URI"] ) . $file_size . "\"" );
header("Last-Modified: " . gmdate( "D, d M Y H:i:s", filemtime($file)) . " GMT");

}

@ob_end_clean();
while (!feof($handle) && connection_status() == 0 && !connection_aborted()) {
set_time_limit(0);
$buffer = fread($handle,8192);
echo $buffer;
@flush();
@ob_flush();
}
fclose($handle);
exit(0);

?>