gistfile1.php

<?php

function FileMimeType($file)
{
  static $finfo;
  if(extension_loaded("fileinfo") || @dl("fileinfo.so"))
  {
    if(!($finfo instanceOf finfo))
    {
      $finfo = new finfo(FILEINFO_MIME|FILEINFO_SYMLINK|FILEINFO_PRESERVE_ATIME, SETTINGS::$MimeMagicFile);
    }

    if($finfo !== false)
    {
      return $finfo->file(realpath($file));
    }
  }

  if ( function_exists('mime_content_type '))
  {
    return mime_content_type(realpath($file));
  }
  else
  {
    return trim(exec('file -bi '.escapeshellarg( realpath($file) )));
  }
}