复制代码 代码如下:

$dowmFile = dirname ( __FILE__ ) . ‘/Nokia – Always Here.mp3′; //要下载的文件，绝对或相对
$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 ) );
//header(‘Content-Type: application/octet-stream\');
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 && $isset_end) {
//分块下载
if ($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 && ! $isset_end) {
//指定位置到结束
if ($start >= $fsize || $start < 0) {
$start = 0;
$end = $fsize;
} else {
$end = $fsize – $start;
}
} else if (! $isset_start && $isset_end) {
//最后n个字节
$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 ( $fname );
}
//@header(“Content-Type: “.mime_content_type($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;
}
}