(PECL ssh2 >= 0.9.0)
ssh2_auth_none — Authenticate as "none"
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.
session
An SSH connection link identifier, obtained from a call to ssh2_connect().
username
Remote user name.
Returns true if the server does accept "none" as an authentication method, or an array of accepted authentication methods on failure.
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";
}
?>
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https://www.php.net/manual/en/function.ssh2-auth-none.php