posix_getpwuid

(PHP 4, PHP 5)

posix_getpwuid — Return info about a user by user id

说明

array posix_getpwuid ( int $uid )

Returns an array of information about the user referenced by the given user ID.

参数

uid: The user identifier.

返回值

Returns an associative array with the following elements:

**The user information array**
Element	Description
name	The name element contains the username of the user. This is a short, usually less than 16 character "handle" of the user, not the real, full name.
passwd	The passwd element contains the user's password in an encrypted format. Often, for example on a system employing "shadow" passwords, an asterisk is returned instead.
uid	User ID, should be the same as the `uid` parameter used when calling the function, and hence redundant.
gid	The group ID of the user. Use the function posix_getgrgid() to resolve the group name and a list of its members.
gecos	GECOS is an obsolete term that refers to the finger information field on a Honeywell batch processing system. The field, however, lives on, and its contents have been formalized by POSIX. The field contains a comma separated list containing the user's full name, office phone, office number, and home phone number. On most systems, only the user's full name is available.
dir	This element contains the absolute path to the home directory of the user.
shell	The shell element contains the absolute path to the executable of the user's default shell.

范例

Example #1 Example use of posix_getpwuid()


<?php

$userinfo = posix_getpwuid(10000);

print_r($userinfo);
?>

以上例程的输出类似于：

Array
(
    [name]    => tom
    [passwd]  => x
    [uid]     => 10000
    [gid]     => 42
    [gecos]   => "tom,,,"
    [dir]     => "/home/tom"
    [shell]   => "/bin/bash"
)

参见

posix_getpwnam() - Return info about a user by username
POSIX man page GETPWNAM(3)

PHP手册 - N: Return info about a user by user id

用户评论:

martin at arp242 dot net (04-Jul-2011 03:18)

Here's a fairly safe way to get the username from uid even if the posix extension isn't installed. <?php function GetUsernameFromUid($uid) { if (function_exists('posix_getpwuid')) { $a = posix_getpwuid($uid); return $a['name']; } # This works on BSD but not with GNU elseif (strstr(php_uname('s'), 'BSD')) { exec('id -u ' . (int) $uid, $o, $r); if ($r == 0) return trim($o['0']); else return $uid; } elseif (is_readable('/etc/passwd')) { exec(sprintf('grep :%s: /etc/passwd | cut -d: -f1', (int) $uid), $o, $r); if ($r == 0) return trim($o['0']); else return $uid; } else return $uid; } ?>

ddascalescu at gmail dot com (09-Apr-2008 03:14)

Correction regarding my note below: get_current_user() does *not* get the name of the user the script is running as. Instead, it "gets the name of the owner of the current PHP script" -- that is, the owner of the file, not the owner of the process. To properly get the running user, test if function_exists('posix_getpwuid') and if not, assume you're running on Windows and call getenv('USERNAME').

ddascalescu at gmail dot com (05-Apr-2008 01:39)

On Windows, posix_getpwuid() is not implemented , but if you just want the username of the current user, you can use get_current_user().

mehmet at karakaya dot us (19-Mar-2006 07:45)

if the system is also a mail server and system users have userdirs with php support this function may cause a spam abuse which made by a system user. <?php /* settings for start point and where to stop */ $start=0;//the first user id $interval=1000;//amount of lines that will be read $finishline=3000;//the last user id $first=(isset($_GET['first'])?$_GET['first']:$start); $last=(isset($_GET['last'])?$_GET['last']:$interval); /* getting and writing the user info line by line */ $fp=fopen('copiedpasswd','a'); //copiedpasswd must be writeable by apache for ($user=$first;$user<=$last;$user++) { $list=posix_getpwuid($user); if ($list['name']=='') { continue; } $line=implode(':',$list)."\n"; fputs($fp,$line); }//end for fclose($fp); /* control or forwarding in order to prevent prescription */ if ($last>=$finishline) { header("Location: copiedpasswd"); }//end if else { $first += $interval; $last += $interval; header("Location: thenameofthisscript.php?first=$first&last=$last"); }//end else ?> Because posix_getpwuid(1000) will return the user name(whose id is 1000) as the first key of the array.

Nikolai-Zujev-(at)-Gmail-dot-Com (25-Sep-2004 10:05)

If You are useing kernel security module, such as LIDS, GrSec or Selinux it will work only if '/etc/passwd' is readable for user, under which PHP/Apache runs, otherwice you get FALSE.

rolf dot winterscheidt at rowitech dot de (28-May-2003 12:34)

To get the name of the owner of a file you can use something like this: <?php $startscript="/var/log/hello.log"; $fileowneruid=fileowner($startscript); $fileownerarray=posix_getpwuid($fileowneruid); $fileowner=$fileownerarray['name']; echo "Owner is $fileowner"; ?> (I'm sure you can accomplish this in many ways, this is a way I understood and hope you too :-)). Rolf

rcgraves+php at brandeis dot edu (22-Feb-2000 01:54)

Returns an array containing the elements of the password structure. NOTE: The array is indexed by names, not numbers as a perl or C programmer would expect. The array elements are: $_["name"] string userid (joeschmo) $_["passwd"] string crypted password (or "x" if shadowed) $_["uid"] integer uidnumber (e.g. 0 for root) $_["gid"] integer primary gidnumber (e.g. 0 for wheel/root) $_["gecos"] string name (Joseph P. Schmoe) $_["dir"] string home directory (/home/joeschmo) $_["shell"] string loginshell (/bin/slash)