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:
<?php
$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: //开源代码phprm.com
if (function_exists('mime_content_type')) {
$fileSuffix = mime_content_type($filename);
} else {
$fileSuffix = 'application/octet-stream';
}
return $fileSuffix;
break;
}
}本文地址:http://www.phprm.com/scxz/fs4990.html
转载随意,但请附上文章地址:-)