<?php  $mime = array (    //applications    'ai'    => 'application/postscript',    'eps'   => 'application/postscript',    'exe'   => 'application/octet-stream',    'doc'   => 'application/vnd.ms-word',    'xls'   => 'application/vnd.ms-excel',    'ppt'   => 'application/vnd.ms-powerpoint',    'pps'   => 'application/vnd.ms-powerpoint',    'pdf'   => 'application/pdf',    'xml'   => 'application/xml',    'odt'   => 'application/vnd.oasis.opendocument.text',    'swf'   => 'application/x-shockwave-flash',    // archives    'gz'    => 'application/x-gzip',    'tgz'   => 'application/x-gzip',    'bz'    => 'application/x-bzip2',    'bz2'   => 'application/x-bzip2',    'tbz'   => 'application/x-bzip2',    'zip'   => 'application/zip',    'rar'   => 'application/x-rar',    'tar'   => 'application/x-tar',    '7z'    => 'application/x-7z-compressed',    // texts    'txt'   => 'text/plain',    'php'   => 'text/x-php',    'html'  => 'text/html',    'htm'   => 'text/html',    'js'    => 'text/javascript',    'css'   => 'text/css',    'rtf'   => 'text/rtf',    'rtfd'  => 'text/rtfd',    'py'    => 'text/x-python',    'java'  => 'text/x-java-source',    'rb'    => 'text/x-ruby',    'sh'    => 'text/x-shellscript',    'pl'    => 'text/x-perl',    'sql'   => 'text/x-sql',    // images    'bmp'   => 'image/x-ms-bmp',    'jpg'   => 'image/jpeg',    'jpeg'  => 'image/jpeg',    'gif'   => 'image/gif',    'png'   => 'image/png',    'tif'   => 'image/tiff',    'tiff'  => 'image/tiff',    'tga'   => 'image/x-targa',    'psd'   => 'image/vnd.adobe.photoshop',    //audio    'mp3'   => 'audio/mpeg',    'mid'   => 'audio/midi',    'ogg'   => 'audio/ogg',    'mp4a'  => 'audio/mp4',    'wav'   => 'audio/wav',    'wma'   => 'audio/x-ms-wma',    // video    'avi'   => 'video/x-msvideo',    'dv'    => 'video/x-dv',    'mp4'   => 'video/mp4',    'mpeg'  => 'video/mpeg',    'mpg'   => 'video/mpeg',    'mov'   => 'video/quicktime',    'wm'    => 'video/x-ms-wmv',    'flv'   => 'video/x-flv',    'mkv'   => 'video/x-matroska'    );    function _getMimeDetect() {   if (class_exists('finfo')) {    return 'finfo';   } else if (function_exists('mime_content_type')) {    return 'mime_content_type';   } else if ( function_exists('exec')) {    $result = exec('file -ib '.escapeshellarg(__FILE__));    if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {     return 'linux';    }    $result = exec('file -Ib '.escapeshellarg(__FILE__));    if ( 0 === strpos($result, 'text/x-php') OR 0 === strpos($result, 'text/x-c++')) {     return 'bsd';    }   }   return 'internal';  }    function _getMimeType($path) {   global $mime;   $fmime = _getMimeDetect();   switch($fmime) {    case 'finfo':     $finfo = finfo_open(FILEINFO_MIME);     if ($finfo)       $type = @finfo_file($finfo, $path);     break;    case 'mime_content_type':     $type = mime_content_type($path);     break;    case 'linux':     $type = exec('file -ib '.escapeshellarg($path));     break;    case 'bsd':     $type = exec('file -Ib '.escapeshellarg($path));     break;    default:     $pinfo = pathinfo($path);     $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';     $type = isset($mime[$ext]) ? $mime[$ext] : 'unkown';     break;   }   $type = explode(';', $type);      //需要加上这段，因为如果使用mime_content_type函数来获取一个不存在的$path时会返回'application/octet-stream'   if ($fmime != 'internal' AND $type[0] == 'application/octet-stream') {    $pinfo = pathinfo($path);     $ext = isset($pinfo['extension']) ? strtolower($pinfo['extension']) : '';    if (!empty($ext) AND !empty($mime[$ext])) {     $type[0] = $mime[$ext];    }   }      return $type[0];  }    $path = '1.txt';  //实际上当前路径并不存在1.txt  var_dump(_getMimeType($path));    /*End of php*/