SSH在xampp中安装php

Question

我需要使用SSH和PHP连接，我有PHP 5.6.8版本，

intall  OpenSSL-Win32;
In php.ini :
extension=libssh2.dll   ;librerias ssl2
extension=php_ssh2.dll 
The libraries are in the folder php---->ext.

With the next program my result is:
Fatal error: Call to undefined function ssh2_connect() in            
    C:\xampp\htdocs\conexion\conexion_ssh.php on line 2

        <?php
        $connection = ssh2_connect('X.X.X.X', XX);

        if (ssh2_auth_password($connection, 'root', 'XXXXXXXX')) {
          echo "Authentication Successful!\n";
        } else {

          die('Authentication Failed...');
        }

        ?>

你知道这个问题吗？我认为配置系统变量PATH但我不知道这个过程。

谢谢你的帮助！