Download file summary

Generate HTTP headers to force the download of data to the client, which is useful when implementing file downloads.
First of all, thanks to @yangweijie's work, based on which a method was derived that does not require opening the php_fileinfo.dll extension.
Method 1: When the extension is enabled//$file file path<br> public function download_file($file){<br> If(is_file($file)){<br>                 $length = filesize($file);<br>               $type = mime_content_type($file);<br>                $showname = ltrim(strrchr($file,'/'),'/');<br> header("Content-Description: File Transfer");<br>              header('Content-type: ' . $type);<br>              header('Content-Length:' . $length);<br> If (preg_match('/MSIE/', $_SERVER['HTTP_USER_AGENT'])) { //for IE<br> header('Content-Disposition: attachment; filename="' . rawurlencode($showname) . '"');<br>                     } else {<br> header('Content-Disposition: attachment; filename="' . $showname . '"');<br>             }<br>                  readfile($file);<br>                                        else {<br>                  $this->error('Source file does not exist!');<br>          }<br> }Method 2, if php_fileinfo.dll is not turned on, who makes us a programmer without server permissions, and we can’t be looked down upon by others, alas! Maybe you will understand. public function force_download($filename)<br> {<br> If ($filename == ''){<br>                                                                                                                                                               return   FALSE;<br>          }<br> If (FALSE === strpos($filename, '.')){<br>                                                                                                                                                               return   FALSE;<br>          }<br>          $x = explode('.', $filename);<br>         $extension = end($x);<br>          $mimes =$this->getMimes();<br> <br> ​​​​//Set a default mime if we can't find it<br> If (! Isset ($ MIMES [$ Extension])) {<br>              $mime = 'application/octet-stream';<br>           }else{<br> $mime = (is_array($mimes[$extension])) ? $mimes[$extension][0] : $mimes[$extension];<br>          }<br> ​​​​//Generate the server headers<br> If (strpos($_SERVER['HTTP_USER_AGENT'], "MSIE") !== FALSE)<br>                                     {<br> header('Content-Type: "'.$mime.'"');<br>                 header('Content-Disposition: attachment; filename="'.$filename.'"');<br> header('Expires: 0');<br>            header('Cache-Control: must-revalidate, post-check=0, pre-check=0');<br>             header("Content-Transfer-Encoding: binary");<br>             header('Pragma: public');<br>             header("Content-Length: ".filesize($filename));<br>         }<br>         else<br>         {<br>             header('Content-Type: "'.$mime.'"');<br>             header('Content-Disposition: attachment; filename="'.$filename.'"');<br>             header("Content-Transfer-Encoding: binary");<br>             header('Expires: 0');<br>             header('Pragma: no-cache');<br>             header("Content-Length: ".filesize($filename));<br>         }<br>         readfile($filename);<br>     }<br> private function getMimes(){<br>         return $mimes = array(    'hqx'    =>    'application/mac-binhex40',<br>             'cpt'    =>    'application/mac-compactpro',<br>             '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'),<br>             'bin'    =>    'application/macbinary',<br>             'dms'    =>    'application/octet-stream',<br>             'lha'    =>    'application/octet-stream',<br>             'lzh'    =>    'application/octet-stream',<br>             'exe'    =>    array('application/octet-stream', 'application/x-msdownload'),<br>             'class'    =>    'application/octet-stream',<br>             'psd'    =>    'application/x-photoshop',<br>             'so'    =>    'application/octet-stream',<br>             'sea'    =>    'application/octet-stream',<br>             'dll'    =>    'application/octet-stream',<br>             'oda'    =>    'application/oda',<br>            'pdf'    =>    array('application/pdf', 'application/x-download'),<br>             'ai'    =>    'application/postscript',<br>             'eps'    =>    'application/postscript',<br>             'ps'    =>    'application/postscript',<br>             'smi'    =>    'application/smil',<br>             'smil'    =>    'application/smil',<br>             'mif'    =>    'application/vnd.mif',<br>             'xls'    =>    array('application/excel', 'application/vnd.ms-excel', 'application/msexcel'),<br>             'ppt'    =>    array('application/powerpoint', 'application/vnd.ms-powerpoint'),<br>             'wbxml'    =>    'application/wbxml',<br>             'wmlc'    =>    'application/wmlc',<br>             'dcr'    =>    'application/x-director',<br>             'dir'    =>    'application/x-director',<br>             'dxr'    =>    'application/x-director',<br>             'dvi'    =>    'application/x-dvi',<br>             'gtar'    =>    'application/x-gtar',<br>             'gz'    =>    'application/x-gzip',<br>             'php'    =>    'application/x-httpd-php',<br>             'php4'    =>    'application/x-httpd-php',<br>             'php3'    =>    'application/x-httpd-php',<br>             'phtml'    =>    'application/x-httpd-php',<br>             'phps'    =>    'application/x-httpd-php-source',<br>             'js'    =>    'application/x-javascript',<br>             'swf'    =>    'application/x-shockwave-flash',<br>             'sit'    =>    'application/x-stuffit',<br>             'tar'    =>    'application/x-tar',<br>            'tgz'    =>    array('application/x-tar', 'application/x-gzip-compressed'),<br>             'xhtml'    =>    'application/xhtml+xml',<br>             'xht'    =>    'application/xhtml+xml',<br>             'zip'    =>  array('application/x-zip', 'application/zip', 'application/x-zip-compressed'),<br>             'mid'    =>    'audio/midi',<br>             'midi'    =>    'audio/midi',<br>             'mpga'    =>    'audio/mpeg',<br>             'mp2'    =>    'audio/mpeg',<br>             'mp3'    =>    array('audio/mpeg', 'audio/mpg', 'audio/mpeg3', 'audio/mp3'),<br>             'aif'    =>    'audio/x-aiff',<br>             'aiff'    =>    'audio/x-aiff',<br>             'aifc'    =>    'audio/x-aiff',<br>             'ram'    =>    'audio/x-pn-realaudio',<br>             'rm'    =>    'audio/x-pn-realaudio',<br>             'rpm'    =>    'audio/x-pn-realaudio-plugin',<br>             'ra'    =>    'audio/x-realaudio',<br>             'rv'    =>    'video/vnd.rn-realvideo',<br>             'wav'    =>    array('audio/x-wav', 'audio/wave', 'audio/wav'),<br>             'bmp'    =>    array('image/bmp', 'image/x-windows-bmp'),<br>             'gif'    =>    'image/gif',<br>             'jpeg'    =>    array('image/jpeg', 'image/pjpeg'),<br>             'jpg'    =>    array('image/jpeg', 'image/pjpeg'),<br>             'jpe'    =>    array('image/jpeg', 'image/pjpeg'),<br>             'png'    =>    array('image/png',  'image/x-png'),<br>             'tiff'    =>    'image/tiff',<br>            'tif'    =>    'image/tiff',<br>             'css'    =>    'text/css',<br>             'html'    =>    'text/html',<br>             'htm'    =>    'text/html',<br>             'shtml'    =>    'text/html',<br>             'txt'    =>    'text/plain',<br>             'text'    =>    'text/plain',<br>             'log'    =>    array('text/plain', 'text/x-log'),<br>             'rtx'    =>    'text/richtext',<br>             'rtf'    =>    'text/rtf',<br>             'xml'    =>    'text/xml',<br>             'xsl'    =>    'text/xml',<br>             'mpeg'    =>    'video/mpeg',<br>             'mpg'    =>    'video/mpeg',<br>             'mpe'    =>    'video/mpeg',<br>             'qt'    =>    'video/quicktime',<br>             'mov'    =>    'video/quicktime',<br>             'avi'    =>    'video/x-msvideo',<br>             'movie'    =>    'video/x-sgi-movie',<br>             'doc'    =>    'application/msword',<br>             'docx'    =>    array('application/vnd.openxmlformats-officedocument.wordprocessingml.document', 'application/zip'),<br>             'xlsx'    =>    array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip'),<br>             'word'    =>    array('application/msword', 'application/octet-stream'),<br>             'xl'    =>    'application/excel',<br>             'eml'    =>    'message/rfc822',<br>             'json' => array('application/json', 'text/json')<br>);Everyone probably understands this, that is, the suffix is ​​used to match the file type. Implement the functions of mime_content_type.
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