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(PECL mailparse >= 0.9.0)
mailparse_determine_best_xfer_encoding — Gets the best way of encoding
$fp 
   )Figures out the best way of encoding the content read from the given file pointer.
fp A valid file pointer, which must be seek-able.
Returns one of the character encodings supported by the mbstring module.
Example #1 mailparse_determine_best_xfer_encoding() example
  <?php
$fp  =  fopen ( 'somemail.eml' ,  'r' );
echo  'Best encoding: '  .  mailparse_determine_best_xfer_encoding ( $fp );
 ?>   以上例程的输出类似于:
Best encoding: 7bit
[#1] matej dot kovac at gmail dot com [2011-11-20 23:12:12]
As of mailparse-2.1.5, it can return 7bit, 8bit, base64 and qprint. False on mbstring failure.
[#2] mileskeaton at gmail dot com [2009-01-02 23:16:41]
As far as I can tell, this only returns one of two strings: 'Quoted-Printable' or '7bit'