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
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;
}
}