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<ssh2_auth_hostbased_filessh2_auth_password>
^SSH2 FunctionsLast updated: Mon, 26 Oct 2026

ssh2_auth_none

(PECL ssh2 >= 0.9.0)

ssh2_auth_none — Authenticate as "none"

Description

function ssh2_auth_none(resource $session, string $username): mixed

Attempt "none" authentication which usually will (and should) fail. As part of the failure, this function will return an array of accepted authentication methods.

Parameters

session

An SSH connection link identifier, obtained from a call to ssh2_connect().

username

Remote user name.

Return Values

Returns true if the server does accept "none" as an authentication method, or an array of accepted authentication methods on failure.

Examples

Example #1 Retrieving a list of authentication methods

<?php
$connection = ssh2_connect('shell.example.com', 22);

$auth_methods = ssh2_auth_none($connection, 'user');

if (in_array('password', $auth_methods)) {
  echo "Server supports password based authentication\n";
}
?>

<ssh2_auth_hostbased_filessh2_auth_password>
^SSH2 FunctionsLast updated: Mon, 26 Oct 2026