ssh2_publickey_init
说明
resource ssh2_publickey_init ( resource session )Request the Publickey subsystem from an already connected SSH2 server.
The publickey subsystem allows an already connected and authenticated client to manage the list of authorized public keys stored on the target server in an implementation agnostic manner. If the remote server does not support the publickey subsystem, the ssh2_publickey_init() function will return FALSE.
注: 公钥系统用于管理服务器上的客户已经被认证的公钥。要用公钥认证方法在远程系统上认证，应该用 ssh2_auth_pubkey_file() 函数。