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//$file 文件路径<br>
public function download_file($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>
$this->error('源文件不存在！');<br>
}<br>
}方法二，如果没有开启php_fileinfo.dll，谁让咱是没有服务器权限的程序员呢，又不能让人家看不起，唉！可能你会懂。public function force_download($filename)<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>
);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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