php支持分块与断点续传文件下载功能代码
本文章要介绍了这篇文章是一篇关于php流下载,就是可以支持分块与断点续传文件下载,有需要的朋友可以看看,代码如下:
- $dowmFile = dirname ( __FILE__ ) . '/Nokia - Always Here.mp3';
- $dowmName = 'Nokia - Always Here.mp3';
- ob_start ();
- getlocalfile ( $dowmFile, $dowmName );
- flush ();
- ob_flush ();
- function getlocalfile($fname, $filename = '') {
- $fsize = filesize ( $fname );
- header ( 'Cache-Control: public' );
- header ( 'Pragma: public' );
- header ( 'Accept-Ranges: bytes' );
- header ( 'Connection: close' );
- header ( 'Content-Type: ' . MIMEType ( $fname ) );
-
- if (isset ( $filename {0} )) {
- header ( 'Content-Disposition: attachment;filename=' . $filename );
- }
- if ($fp = @fopen ( $fname, 'rb' )) {
- $start = 0;
- $end = $fsize;
- $isRange = isset ( $_SERVER ['HTTP_RANGE'] ) && ($_SERVER ['HTTP_RANGE'] != '');
- if ($isRange) {
- preg_match ( '/^bytes=([0-9]*)-([0-9]*)$/i', $_SERVER ['HTTP_RANGE'], $match );
- $start = $match [1];
- $end = $match [2];
- $isset_start = isset ( $start {0} );
- $isset_end = isset ( $end {0} );
- if ($isset_start && $isset_end) {
-
- if ($start >= $fsize || $start < 0 || $start > $end) {
- $start = 0;
- $end = $fsize;
- } else if ($end >= $fsize) {
- $end = $fsize - $start;
- } else {
- $end -= $start - 1;
- }
- } else if ($isset_start && ! $isset_end) {
-
- if ($start >= $fsize || $start < 0) {
- $start = 0;
- $end = $fsize;
- } else {
- $end = $fsize - $start;
- }
- } else if (! $isset_start && $isset_end) {
-
- $end = $end > $fsize ? $fsize : $end;
- $start = $fsize - $end;
- } else {
- $start = 0;
- $end = $fsize;
- }
- }
- if ($isRange) {
- fseek ( $fp, $start );
- header ( 'HTTP/1.1 206 Partial Content' );
- header ( 'Content-Length: ' . $end );
- header ( 'Content-Ranges: bytes ' . $start . '-' . ($end + $start - 1) . '/' . $fsize );
- } else {
- header ( 'Content-Length: ' . $fsize );
- }
- if (function_exists ( 'fpassthru' ) && ($end + $start) == $fsize) {
- fpassthru ( $fp );
- } else {
- echo fread ( $fp, $end );
- }
- } else {
- header ( 'Content-Length: ' . $fsize );
- readfile ( $fname );
- }
-
- }
- function MIMEType($fname) {
- $fileSuffix = strtolower ( substr ( $fname, strrpos ( $fname, '.' ) + 1 ) );
- switch ($fileSuffix) {
- case 'avi' :
- return 'video/msvideo';
- case 'wmv' :
- return 'video/x-ms-wmv';
- case 'txt' :
- return 'text/plain';
- case 'htm' :
- case 'html' :
- case 'php' :
- return 'text/html';
- case 'css' :
- return 'text/css';
- case 'js' :
- return 'application/javascript';
- case 'json' :
- case 'xml' :
- case 'zip' :
- case 'pdf' :
- case 'rtf' :
- case 'tar' :
- return 'application/' . $fileSuffix;
- case 'swf' :
- return 'application/x-shockwave-flash';
- case 'flv' :
- return 'video/x-flv';
- case 'jpe' :
- case 'jpg' :
- return 'image/jpeg';
- case 'jpeg' :
- case 'png' :
- case 'gif' :
- case 'bmp' :
- case 'tiff' :
- return 'image/' . $fileSuffix;
- case 'ico' :
- return 'image/vnd.microsoft.icon';
- case 'tif' :
- return 'image/tiff';
- case 'svg' :
- case 'svgz' :
- return 'image/svg+xml';
- case 'rar' :
- return 'application/x-rar-compressed';
- case 'exe' :
- case 'msi' :
- return 'application/x-msdownload';
- case 'cab' :
- return 'application/vnd.ms-cab-compressed';
- case 'aif' :
- return 'audio/aiff';
- case 'mpg' :
- case 'mpe' :
- case 'mp3' :
- return 'audio/mpeg';
- case 'mpeg' :
- case 'wav' :
- case 'aiff' :
- return 'audio/' . $fileSuffix;
- case 'qt' :
- case 'mov' :
- return 'video/quicktime';
- case 'psd' :
- return 'image/vnd.adobe.photoshop';
- case 'ai' :
- case 'eps' :
- case 'ps' :
- return 'application/postscript';
- case 'doc' :
- case 'docx' :
- return 'application/msword';
- case 'xls' :
- case 'xlt' :
- case 'xlm' :
- case 'xld' :
- case 'xla' :
- case 'xlc' :
- case 'xlw' :
- case 'xll' :
- return 'application/vnd.ms-excel';
- case 'ppt' :
- case 'pps' :
- return 'application/vnd.ms-powerpoint';
- case 'odt' :
- return 'application/vnd.oasis.opendocument.text';
- case 'ods' :
- return 'application/vnd.oasis.opendocument.spreadsheet';
- default :
- if (function_exists ( 'mime_content_type' )) {
- $fileSuffix = mime_content_type ( $filename );
- } else {
- $fileSuffix = 'application/octet-stream';
- }
- return $fileSuffix;
- break;
- }
- }