<?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*/