(PECL ssh2 >= 0.10)
Add an authorized publickey
bool ssh2_publickey_add ( resource $pkey, string $algoname, string $blob [, bool $overwrite = false [, array $attributes ]] )
Note: The public key subsystem is used for managing public keys on a server to which the client is already authenticated. To authenticate to a remote system using public key authentication, use the ssh2_auth_pubkey_file() function instead.