posix_getgrgid()

(PHP 4, PHP 5, PHP 7)

Return info about a group by group id

说明

posix_getgrgid(int $gid): array

Gets information about a group provided its id.

参数

$gid: The group id.

返回值

The array elements returned are:

**The group information array**
Element	Description
name	The name element contains the name of the group. This is a short, usually less than 16 character "handle" of the group, not the real, full name.
passwd	The passwd element contains the group's password in an encrypted format. Often, for example on a system employing "shadow" passwords, an asterisk is returned instead.
gid	Group ID, should be the same as the`$gid`parameter used when calling the function, and hence redundant.
members	This consists of an array of string's for all the members in the group.

范例

Example use of posix_getgrgid()

<?php
$groupid   = posix_getegid();
$groupinfo = posix_getgrgid($groupid);
print_r($groupinfo);
?>

以上例程的输出类似于：

Array
(
    [name]    => toons
    [passwd]  => x
    [members] => Array
        (
            [0] => tom
            [1] => jerry
        )
    [gid]     => 42
)

参见

posix_getegid()Return the effective group ID of the current process
posix_getgrnam()Return info about a group by name
filegroup()取得文件的组
stat()给出文件的信息
safe_mode_gid
POSIX man page GETGRNAM(3)

okies...
This code should be considered as an OPTION only, it works under MY set of circumstances, and that is all I intended. The below funtion will return the NAME of the GROUP if provided with the Group ID#
 function RC_posix_getgrgid($gid) 
  {
  $LocationGroup = "/etc/group"; //EDIT THIS IF YOU HAVE A DIFFERENT OS. mine = debian
  $fp = fopen ("/etc/group","r");
  while ($groupinfo = fscanf ($fp, "%[a-zA-Z0-9]:x:%[0-9]:%[a-zA-Z0-9]\n")) 
    {
    list ($name, $groupID, $nfi) = $groupinfo;
    if ($groupID == $gid)
      {
      $returnval = $name;
      }
    }
  fclose($fp);
  if($returnval) { return $returnval; } else { return 0; }
  }

When posix_getgrgid() fails (e.g. an invalid/unknown group id), it returns false.
This is except for Mac OSX on which you get an array with name "nogroup" and gid of "-1".

in php-4.3 the array returned seems to have changed.
it now returns:
["name"] group name
["passwd"] group password
["members"] group members (array of usernames)
["gid"] numeric group id

Returns an array containing the elements of the group structure. The array has both numeric indices, each of which is a string naming one member of the group, and named string indices. The array elements are:
$_["name"] string groupname (users)
$_["gid"] integer gidnumber (e.g. 0 for wheel/root)
$_["members"] int number of users in group
$_[0]..$_[n] string usernames in the group