<?phpif(!function_exists(‘mime_content_type‘)) { ???function mime_content_type($filename) { ???????$mime_types = array( ???????????‘txt‘ => ‘text/plain‘, ???????????‘htm‘ => ‘text/html‘, ???????????‘html‘ => ‘text/html‘, ???????????‘php‘ => ‘text/html‘, ???????????‘css‘ => ‘text/css‘, ???????????‘js‘ => ‘application/javascript‘, ???????????‘json‘ => ‘application/json‘, ???????????‘xml‘ => ‘application/xml‘, ???????????‘swf‘ => ‘application/x-shockwave-flash‘, ???????????‘flv‘ => ‘video/x-flv‘, ???????????// images ???????????‘png‘ => ‘image/png‘, ???????????‘jpe‘ => ‘image/jpeg‘, ???????????‘jpeg‘ => ‘image/jpeg‘, ???????????‘jpg‘ => ‘image/jpeg‘, ???????????‘gif‘ => ‘image/gif‘, ???????????‘bmp‘ => ‘image/bmp‘, ???????????‘ico‘ => ‘image/vnd.microsoft.icon‘, ???????????‘tiff‘ => ‘image/tiff‘, ???????????‘tif‘ => ‘image/tiff‘, ???????????‘svg‘ => ‘image/svg+xml‘, ???????????‘svgz‘ => ‘image/svg+xml‘, ???????????// archives ???????????‘zip‘ => ‘application/zip‘, ???????????‘rar‘ => ‘application/x-rar-compressed‘, ???????????‘exe‘ => ‘application/x-msdownload‘, ???????????‘msi‘ => ‘application/x-msdownload‘, ???????????‘cab‘ => ‘application/vnd.ms-cab-compressed‘, ???????????// audio/video ???????????‘mp3‘ => ‘audio/mpeg‘, ???????????‘qt‘ => ‘video/quicktime‘, ???????????‘mov‘ => ‘video/quicktime‘, ???????????// adobe ???????????‘pdf‘ => ‘application/pdf‘, ???????????‘psd‘ => ‘image/vnd.adobe.photoshop‘, ???????????‘ai‘ => ‘application/postscript‘, ???????????‘eps‘ => ‘application/postscript‘, ???????????‘ps‘ => ‘application/postscript‘, ???????????// ms office ???????????‘doc‘ => ‘application/msword‘, ???????????‘rtf‘ => ‘application/rtf‘, ???????????‘xls‘ => ‘application/vnd.ms-excel‘, ???????????‘ppt‘ => ‘application/vnd.ms-powerpoint‘, ???????????// open office ???????????‘odt‘ => ‘application/vnd.oasis.opendocument.text‘, ???????????‘ods‘ => ‘application/vnd.oasis.opendocument.spreadsheet‘, ???????); ???????$ext = strtolower(array_pop(explode(‘.‘,$filename))); ???????if (array_key_exists($ext, $mime_types)) { ???????????return $mime_types[$ext]; ???????} ???????elseif (function_exists(‘finfo_open‘)) { ???????????$finfo = finfo_open(FILEINFO_MIME); ???????????$mimetype = finfo_file($finfo, $filename); ???????????finfo_close($finfo); ???????????return $mimetype; ???????} ???????else { ???????????return ‘application/octet-stream‘; ???????} ???}}?>http://php.net/manual/en/function.mime-content-type.php
php 下载文件的头信息 Determine Content Type
原文地址：http://www.cnblogs.com/lxwphp/p/8094057.html