PHP 8.4.1 Released!

    posix_getgrgid

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

    posix_getgrgid — Return info about a group by group id

    Description

    posix_getgrgid(int $group_id): array|false

    Gets information about a group provided its id.

    Parameters

    group_id

    The group id.

    Return Values

    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.

    Examples

    Example #1 Example use of posix_getgrgid()

    <?php

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

    print_r($groupinfo);
    ?>

    The above example will output something similar to:

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

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    User Contributed Notes 4 notes

    up
    1
    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; }
    }
    up
    0
    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".
    up
    0
    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
    up
    0
    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
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