# MongoDB::authenticate

(PECL mongo >=1.0.1)

MongoDB::authenticate — Log in to this database

> This extension that defines this method is deprecated. Instead, the MongoDB extension should be used. There is no equivalent for this method in the new extension.

> Instead, you need to provide credentials through the connection string.

### Description

public MongoDB::authenticate ( string `$username` , string `$password` ) : array

This method causes its connection to be authenticated. If authentication is enabled for the database server (it's not, by default), you need to log in before the database will allow you to do anything.

In general, you should use the authenticate built into MongoClient::__construct() in preference to this method. If you authenticate on connection and the connection drops and reconnects during your session, you'll be reauthenticated. If you manually authenticated using this method and the connection drops, you'll have to call this method again once you're reconnected.

This method is identical to running:

`<?php
$salted = "${username}:mongo:${password}";
$hash = md5($salted);
$nonce = $db->command(array("getnonce" => 1));
$saltedHash = md5($nonce["nonce"]."${username}${hash}");
$result = $db->command(array("authenticate" => 1,
"user" => $username,
"nonce" => $nonce["nonce"],
"key" => $saltedHash
));
?>`

Once a connection has been authenticated, it can only be un-authenticated by using the "logout" database command:

`<?php
$db->command(array("logout" => 1));
?>`

### Parameters

`username`

  The username.

`password`

  The password (in plaintext).

### Return Values

Returns database response. If the login was successful, it will return

`<?php
array("ok" => 1);
?>`
If something went wrong, it will return
`<?php
array("ok" => 0, "errmsg" => "auth fails");
?>`
("auth fails" could be another message, depending on database version and what when wrong).

### See Also

MongoDB core docs on » authenticate.

### Changelog

Version | Description
--- | ---
PECL mongo 1.2.11 | Emits `E_DEPRECATED` when used. Please pass in the authentication details to the constructor.