<?php
namespace download;
class ForceDownload
{
/**
* Force Download
*
* Generates headers that force a download to happen
*
* @param	string	filename
* @param	mixed	the data to be downloaded
* @param	bool	whether to try and send the actual file MIME type
* @return	void
*/
public function force_download($filename = '', $data = '', $set_mime = FALSE)
{
if ($filename === '' OR $data === '')
{
return;
}
elseif ($data === NULL)
{
if ( ! @is_file($filename) OR ($filesize = @filesize($filename)) === FALSE)
{
return;
}
$filepath = $filename;
$filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));
$filename = end($filename);
}
else
{
$filesize = strlen($data);
}
// Set the default MIME type to send
$mime = 'application/octet-stream';
$x = explode('.', $filename);
$extension = end($x);
if ($set_mime === TRUE)
{
if (count($x) === 1 OR $extension === '')
{
/* If we're going to detect the MIME type,
* we'll need a file extension.
*/
return;
}
// Load the mime types
$mimes =& self::get_mimes();
// Only change the default MIME if we can find one
if (isset($mimes[$extension]))
{
$mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];
}
}
/* It was reported that browsers on Android 2.1 (and possibly older as well)
* need to have the filename extension upper-cased in order to be able to
* download it.
*
* Reference: http://digiblog.de/2011/04/19/android-and-the-download-file-headers/
*/
if (count($x) !== 1 && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('/Android\s(1|2\.[01])/', $_SERVER['HTTP_USER_AGENT']))
{
$x[count($x) - 1] = strtoupper($extension);
$filename = implode('.', $x);
}
if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)
{
return;
}
// Clean output buffer
if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)
{
@ob_clean();
}
// Generate the server headers
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.$filename.'"');
header('Expires: 0');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.$filesize);
header('Cache-Control: private, no-transform, no-store, must-revalidate');
// If we have raw data - just dump it
if ($data !== NULL)
{
exit($data);
}
// Flush 1MB chunks of data
while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)
{
echo $data;
}
fclose($fp);
exit;
}
public static function &get_mimes()
{
static $_mimes;
if (empty($_mimes))
{
$_mimes = array(
'hqx'	=>	array('application/mac-binhex40', 'application/mac-binhex', 'application/x-binhex40', 'application/x-mac-binhex40'),
'cpt'	=>	'application/mac-compactpro',
'csv'	=>	array('text/x-comma-separated-values', 'text/comma-separated-values', 'application/octet-stream', 'application/vnd.ms-excel', 'application/x-csv', 'text/x-csv', 'text/csv', 'application/csv', 'application/excel', 'application/vnd.msexcel', 'text/plain'),
'bin'	=>	array('application/macbinary', 'application/mac-binary', 'application/octet-stream', 'application/x-binary', 'application/x-macbinary'),
'dms'	=>	'application/octet-stream',
'lha'	=>	'application/octet-stream',
'lzh'	=>	'application/octet-stream',
'exe'	=>	array('application/octet-stream', 'application/x-msdownload'),
'class'	=>	'application/octet-stream',
'psd'	=>	array('application/x-photoshop', 'image/vnd.adobe.photoshop'),
'so'	=>	'application/octet-stream',
'sea'	=>	'application/octet-stream',
'dll'	=>	'application/octet-stream',
'oda'	=>	'application/oda',
'pdf'	=>	array('application/pdf', 'application/force-download', 'application/x-download', 'binary/octet-stream'),
'ai'	=>	array('application/pdf', 'application/postscript'),
'eps'	=>	'application/postscript',
'ps'	=>	'application/postscript',
'smi'	=>	'application/smil',
'smil'	=>	'application/smil',
'mif'	=>	'application/vnd.mif',
'xls'	=>	array('application/vnd.ms-excel', 'application/msexcel', 'application/x-msexcel', 'application/x-ms-excel', 'application/x-excel', 'application/x-dos_ms_excel', 'application/xls', 'application/x-xls', 'application/excel', 'application/download', 'application/vnd.ms-office', 'application/msword'),
'ppt'	=>	array('application/powerpoint', 'application/vnd.ms-powerpoint', 'application/vnd.ms-office', 'application/msword'),
'pptx'	=> 	array('application/vnd.openxmlformats-officedocument.presentationml.presentation', 'application/x-zip', 'application/zip'),
'wbxml'	=>	'application/wbxml',
'wmlc'	=>	'application/wmlc',
'dcr'	=>	'application/x-director',
'dir'	=>	'application/x-director',
'dxr'	=>	'application/x-director',
'dvi'	=>	'application/x-dvi',
'gtar'	=>	'application/x-gtar',
'gz'	=>	'application/x-gzip',
'gzip'  =>	'application/x-gzip',
'php'	=>	array('application/x-httpd-php', 'application/php', 'application/x-php', 'text/php', 'text/x-php', 'application/x-httpd-php-source'),
'php4'	=>	'application/x-httpd-php',
'php3'	=>	'application/x-httpd-php',
'phtml'	=>	'application/x-httpd-php',
'phps'	=>	'application/x-httpd-php-source',
'js'	=>	array('application/x-javascript', 'text/plain'),
'swf'	=>	'application/x-shockwave-flash',
'sit'	=>	'application/x-stuffit',
'tar'	=>	'application/x-tar',
'tgz'	=>	array('application/x-tar', 'application/x-gzip-compressed'),
'z'	=>	'application/x-compress',
'xhtml'	=>	'application/xhtml+xml',
'xht'	=>	'application/xhtml+xml',
'zip'	=>	array('application/x-zip', 'application/zip', 'application/x-zip-compressed', 'application/s-compressed', 'multipart/x-zip'),
'rar'	=>	array('application/x-rar', 'application/rar', 'application/x-rar-compressed'),
'mid'	=>	'audio/midi',
'midi'	=>	'audio/midi',
'mpga'	=>	'audio/mpeg',
'mp2'	=>	'audio/mpeg',
'mp3'	=>	array('audio/mpeg', 'audio/mpg', 'audio/mpeg3', 'audio/mp3'),
'aif'	=>	array('audio/x-aiff', 'audio/aiff'),
'aiff'	=>	array('audio/x-aiff', 'audio/aiff'),
'aifc'	=>	'audio/x-aiff',
'ram'	=>	'audio/x-pn-realaudio',
'rm'	=>	'audio/x-pn-realaudio',
'rpm'	=>	'audio/x-pn-realaudio-plugin',
'ra'	=>	'audio/x-realaudio',
'rv'	=>	'video/vnd.rn-realvideo',
'wav'	=>	array('audio/x-wav', 'audio/wave', 'audio/wav'),
'bmp'	=>	array('image/bmp', 'image/x-bmp', 'image/x-bitmap', 'image/x-xbitmap', 'image/x-win-bitmap', 'image/x-windows-bmp', 'image/ms-bmp', 'image/x-ms-bmp', 'application/bmp', 'application/x-bmp', 'application/x-win-bitmap'),
'gif'	=>	'image/gif',
'jpeg'	=>	array('image/jpeg', 'image/pjpeg'),
'jpg'	=>	array('image/jpeg', 'image/pjpeg'),
'jpe'	=>	array('image/jpeg', 'image/pjpeg'),
'png'	=>	array('image/png',  'image/x-png'),
'tiff'	=>	'image/tiff',
'tif'	=>	'image/tiff',
'css'	=>	array('text/css', 'text/plain'),
'html'	=>	array('text/html', 'text/plain'),
'htm'	=>	array('text/html', 'text/plain'),
'shtml'	=>	array('text/html', 'text/plain'),
'txt'	=>	'text/plain',
'text'	=>	'text/plain',
'log'	=>	array('text/plain', 'text/x-log'),
'rtx'	=>	'text/richtext',
'rtf'	=>	'text/rtf',
'xml'	=>	array('application/xml', 'text/xml', 'text/plain'),
'xsl'	=>	array('application/xml', 'text/xsl', 'text/xml'),
'mpeg'	=>	'video/mpeg',
'mpg'	=>	'video/mpeg',
'mpe'	=>	'video/mpeg',
'qt'	=>	'video/quicktime',
'mov'	=>	'video/quicktime',
'avi'	=>	array('video/x-msvideo', 'video/msvideo', 'video/avi', 'application/x-troff-msvideo'),
'movie'	=>	'video/x-sgi-movie',
'doc'	=>	array('application/msword', 'application/vnd.ms-office'),
'docx'	=>	array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip', 'application/msword', 'application/x-zip'),
'dot'	=>	array('application/msword', 'application/vnd.ms-office'),
'dotx'	=>	array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip', 'application/msword'),
'xlsx'	=>	array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip', 'application/vnd.ms-excel', 'application/msword', 'application/x-zip'),
'word'	=>	array('application/msword', 'application/octet-stream'),
'xl'	=>	'application/excel',
'eml'	=>	'message/rfc822',
'json'  =>	array('application/json', 'text/json'),
'pem'   =>	array('application/x-x509-user-cert', 'application/x-pem-file', 'application/octet-stream'),
'p10'   =>	array('application/x-pkcs10', 'application/pkcs10'),
'p12'   =>	'application/x-pkcs12',
'p7a'   =>	'application/x-pkcs7-signature',
'p7c'   =>	array('application/pkcs7-mime', 'application/x-pkcs7-mime'),
'p7m'   =>	array('application/pkcs7-mime', 'application/x-pkcs7-mime'),
'p7r'   =>	'application/x-pkcs7-certreqresp',
'p7s'   =>	'application/pkcs7-signature',
'crt'   =>	array('application/x-x509-ca-cert', 'application/x-x509-user-cert', 'application/pkix-cert'),
'crl'   =>	array('application/pkix-crl', 'application/pkcs-crl'),
'der'   =>	'application/x-x509-ca-cert',
'kdb'   =>	'application/octet-stream',
'pgp'   =>	'application/pgp',
'gpg'   =>	'application/gpg-keys',
'sst'   =>	'application/octet-stream',
'csr'   =>	'application/octet-stream',
'rsa'   =>	'application/x-pkcs7',
'cer'   =>	array('application/pkix-cert', 'application/x-x509-ca-cert'),
'3g2'   =>	'video/3gpp2',
'3gp'   =>	array('video/3gp', 'video/3gpp'),
'mp4'   =>	'video/mp4',
'm4a'   =>	'audio/x-m4a',
'f4v'   =>	'video/mp4',
'webm'	=>	'video/webm',
'aac'   =>	'audio/x-acc',
'm4u'   =>	'application/vnd.mpegurl',
'm3u'   =>	'text/plain',
'xspf'  =>	'application/xspf+xml',
'vlc'   =>	'application/videolan',
'wmv'   =>	array('video/x-ms-wmv', 'video/x-ms-asf'),
'au'    =>	'audio/x-au',
'ac3'   =>	'audio/ac3',
'flac'  =>	'audio/x-flac',
'ogg'   =>	'audio/ogg',
'kmz'	=>	array('application/vnd.google-earth.kmz', 'application/zip', 'application/x-zip'),
'kml'	=>	array('application/vnd.google-earth.kml+xml', 'application/xml', 'text/xml'),
'ics'	=>	'text/calendar',
'ical'	=>	'text/calendar',
'zsh'	=>	'text/x-scriptzsh',
'7zip'	=>	array('application/x-compressed', 'application/x-zip-compressed', 'application/zip', 'multipart/x-zip'),
'cdr'	=>	array('application/cdr', 'application/coreldraw', 'application/x-cdr', 'application/x-coreldraw', 'image/cdr', 'image/x-cdr', 'zz-application/zz-winassoc-cdr'),
'wma'	=>	array('audio/x-ms-wma', 'video/x-ms-asf'),
'jar'	=>	array('application/java-archive', 'application/x-java-application', 'application/x-jar', 'application/x-compressed'),
'svg'	=>	array('image/svg+xml', 'application/xml', 'text/xml'),
'vcf'	=>	'text/x-vcard',
'srt'	=>	array('text/srt', 'text/plain'),
'vtt'	=>	array('text/vtt', 'text/plain'),
'ico'	=>	array('image/x-icon', 'image/x-ico', 'image/vnd.microsoft.icon')
);
}
return $_mimes;
}
}

调用

public function down(){
$down = new ForceDownload();
$down->force_download('uploads/xx.pdf',NULL,TRUE);
}

ThinkPHP 5 使用方法

放到 extend/download/ 文件夹下,即 extend/download/ForceDownload.php

实例化 $down = new \download\ForceDownload();

调用  $down->force_download(‘uploads/xx.pdf’,NULL,TRUE);

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