Description
mixed 
ssh2_auth_none ( resource session, string username )
     Attempt "none" authentication which usually will (and should) fail.
     As part of the failure, this function will return an array of accepted
     authentication methods.  If the server does accept "none" as an
     authentication method for username, this function
     will simply return TRUE.
    
Example 1. Using ssh2_auth_none() to retreive
            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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