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.

范例

Example #1 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

User Contributed Notes

cweiske at php dot net 10-May-2009 07:50
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".
james at jfc dot org dot uk 16-Apr-2003 11:21
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
tech at dslip dot com dot au 13-May-2002 06:27
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; }
    }
rcgraves+php at brandeis dot edu 21-Feb-2000 06:10
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