一个用于PHP实现telnet终端的类,可以模拟实现telnet登录交换机设备，输入指令并输出结果- strongly recommend that you do not store your username and password in a PHP scr ipt unless only people you trust completely have access to your server. Instead, use a form to enter the username and password each time the scr ipt is run. Exercise caution with any system that transmits passwords over unencrypted connections