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(PECL rar >= 2.0.0)
RarArchive::getComment -- rar_comment_get — Get comment text from the RAR archive
面向对象风格 (method):
过程化风格:
$rarfile 
   )Get the (global) comment stored in the RAR archive. It may be up to 64 KiB long.
Note:
This extension does not support comments at the entry level.
rarfile A RarArchive object, opened with rar_open() .
   Returns the comment or  NULL  if there is none.
  
Note:
RAR has currently no support for unicode comments. The encoding of the result of this function is not specified, but it will probably be Windows-1252.
Example #1 面向对象风格
  <?php
$rar_arch  =  RarArchive :: open ( 'commented.rar' ); 
echo  $rar_arch -> getComment ();
 ?>   以上例程的输出类似于:
This is the comment of the file commented.rar.
Example #2 过程化风格
  <?php
$rar_arch  =  rar_open ( 'commented.rar' ); 
echo  rar_comment_get ( $rar_arch );
 ?>