Description
array 
posix_getgrgid ( int gid)
     Returns an array of information about a group and
     FALSE on failure.  If gid isn't a number
     then NULL is returned and an E_WARNING 
     level error is generated.
    
     
| 例子 1. Example use of posix_getgrgid() | 
<?php
 $groupid   = posix_getegid();
 $groupinfo = posix_getgrgid($groupid);
 
 print_r($groupinfo);
 
 ?>
 | 
 
       An example output:
       | Array
(
    [name]    => toons
    [passwd]  => x
    [members] => Array 
        ( 
            [0] => tom
            [1] => jerry
        )
    [gid]     => 42
) | 
 | 
    注: 
      As of PHP 4.2.0, members is returned as an array of member
      usernames in the group.  Before this time it was simply an 
      integer (the number of members in the group) and the member
      names were returned with numerical indices.
     
     See also posix_getegid(),  
     filegroup(),
     stat(), and 
     safe_mode_gid.