posix_getgrgid

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_getgrgid — Return info about a group by group id

说明

posix_getgrgid(int $group_id): array|false

Gets information about a group provided its id.

参数

group_id: 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 `group_id` 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.

The function returns false on failure.

示例

示例 #1 Example use of posix_getgrgid()

<?php

$groupid   = posix_getegid();
$groupinfo = posix_getgrgid($groupid);

print_r($groupinfo);
?>

以上示例的输出类似于：

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
POSIX man page GETGRNAM(3)

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用户贡献的备注 4 notes

down

tech at dslip dot com dot au ¶

22 years ago

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; }
    }

down

cweiske at php dot net ¶

15 years ago

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".

down

james at jfc dot org dot uk ¶

21 years ago

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

down

rcgraves+php at brandeis dot edu ¶

24 years ago

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