生成 HTTP 头强制下载数据到客户端，这在实现文件下载时很有用。
首先感谢@yangweijie的作品，在此基础上衍生出不需要开启php_fileinfo.dll扩展的方法。
方法一：开启扩展情况下
//$file 文件路径- public function download_file($file){
- if(is_file($file)){
- $length = filesize($file);
- $type = mime_content_type($file);
- $showname = ltrim(strrchr($file,’/’),’/’);
- header(“Content-Description: File Transfer”);
- header(‘Content-type: ‘ . $type);
- header(‘Content-Length:’ . $length);
- if (preg_match(‘/MSIE/’, $_SERVER[‘HTTP_USER_AGENT’])) {
//for IE - header(‘Content-Disposition: attachment; filename=”‘ . rawurlencode($showname) . ‘”‘);
- } else {
- header(‘Content-Disposition: attachment; filename=”‘ . $showname . ‘”‘);
- }
- readfile($file);
- } else {
- $this->error(‘源文件不存在！’);
- }
- }
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方法二，如果没有开启php_fileinfo.dll，谁让咱是没有服务器权限的程序员呢，又不能让人家看不起，唉！可能你会懂。
public function force_download($filename)- {
- if ($filename == ”){
- return FALSE;
- }
- if (FALSE === strpos($filename, ‘.’)){
- return FALSE;
- }
- $x = explode(‘.’, $filename);
- $extension = end($x);
- $mimes =$this->getMimes();
- // Set a default mime if we can’t find it
- if ( ! isset($mimes[$extension])){
- $mime = ‘application/octet-stream’;
- }else{
- $mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];
- }
- // Generate the server headers
- if (strpos($_SERVER[‘HTTP_USER_AGENT’], “MSIE”) !== FALSE)
- {
- header(‘Content-Type: “‘.$mime.'”‘);
- header(‘Content-Disposition: attachment; filename=”‘.$filename.'”‘);
- header(‘Expires: 0’);
- header(‘Cache-Control: must-revalidate, post-check=0, pre-check=0’);
- header(“Content-Transfer-Encoding: binary”);
- header(‘Pragma: public’);
- header(“Content-Length: “.filesize($filename));
- }
- else
- {
- header(‘Content-Type: “‘.$mime.'”‘);
- header(‘Content-Disposition: attachment; filename=”‘.$filename.'”‘);
- header(“Content-Transfer-Encoding: binary”);
- header(‘Expires: 0’);
- header(‘Pragma: no-cache’);
- header(“Content-Length: “.filesize($filename));
- }
- readfile($filename);
- }
- private function getMimes(){
- return $mimes = array( ‘hqx’ => ‘application/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’),
- ‘bin’ => ‘application/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’ => ‘application/x-photoshop’,
- ‘so’ => ‘application/octet-stream’,
- ‘sea’ => ‘application/octet-stream’,
- ‘dll’ => ‘application/octet-stream’,
- ‘oda’ => ‘application/oda’,
- ‘pdf’ => array(‘application/pdf’, ‘application/x-download’),
- ‘ai’ => ‘application/postscript’,
- ‘eps’ => ‘application/postscript’,
- ‘ps’ => ‘application/postscript’,
- ‘smi’ => ‘application/smil’,
- ‘smil’ => ‘application/smil’,
- ‘mif’ => ‘application/vnd.mif’,
- ‘xls’ => array(‘application/excel’, ‘application/vnd.ms-excel’, ‘application/msexcel’),
- ‘ppt’ => array(‘application/powerpoint’, ‘application/vnd.ms-powerpoint’),
- ‘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’,
- ‘php’ => ‘application/x-httpd-php’,
- ‘php4’ => ‘application/x-httpd-php’,
- ‘php3’ => ‘application/x-httpd-php’,
- ‘phtml’ => ‘application/x-httpd-php’,
- ‘phps’ => ‘application/x-httpd-php-source’,
- ‘js’ => ‘application/x-javascript’,
- ‘swf’ => ‘application/x-shockwave-flash’,
- ‘sit’ => ‘application/x-stuffit’,
- ‘tar’ => ‘application/x-tar’,
- ‘tgz’ => array(‘application/x-tar’, ‘application/x-gzip-compressed’),
- ‘xhtml’ => ‘application/xhtml+xml’,
- ‘xht’ => ‘application/xhtml+xml’,
- ‘zip’ => array(‘application/x-zip’, ‘application/zip’, ‘application/x-zip-compressed’),
- ‘mid’ => ‘audio/midi’,
- ‘midi’ => ‘audio/midi’,
- ‘mpga’ => ”,
- ‘mp2’ => ”,
- ‘mp3’ => array(”, ‘audio/mpg’, ‘3’, ‘audio/mp3’),
- ‘aif’ => ‘audio/x-aiff’,
- ‘aiff’ => ‘audio/x-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-windows-bmp’),
- ‘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’ => ‘text/css’,
- ‘html’ => ‘text/html’,
- ‘htm’ => ‘text/html’,
- ‘shtml’ => ‘text/html’,
- ‘txt’ => ‘text/plain’,
- ‘text’ => ‘text/plain’,
- ‘log’ => array(‘text/plain’, ‘text/x-log’),
- ‘rtx’ => ‘text/richtext’,
- ‘rtf’ => ‘text/rtf’,
- ‘xml’ => ‘text/xml’,
- ‘xsl’ => ‘text/xml’,
- ‘mpeg’ => ‘video/mpeg’,
- ‘mpg’ => ‘video/mpeg’,
- ‘mpe’ => ‘video/mpeg’,
- ‘qt’ => ‘video/quicktime’,
- ‘mov’ => ‘video/quicktime’,
- ‘avi’ => ‘video/x-msvideo’,
- ‘movie’ => ‘video/x-sgi-movie’,
- ‘doc’ => ‘application/msword’,
- ‘docx’ => array(‘application/vnd.openxmlformats-officedocument.wordprocessingml.document’, ‘application/zip’),
- ‘xlsx’ => array(‘application/vnd.openxmlformats-officedocument.spreadsheetml.sheet’, ‘application/zip’),
- ‘word’ => array(‘application/msword’, ‘application/octet-stream’),
- ‘xl’ => ‘application/excel’,
- ’eml’ => ‘message/rfc822’,
- ‘json’ => array(‘application/json’, ‘text/json’)
- );
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看到这里估计大家都懂了，就是由后缀去匹配文件类型。实现mime_content_type的功能。
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