Removes an authorized publickey.
pkey
Publickey Subsystem Resource
algoname
Publickey algorithm (e.g.): ssh-dss, ssh-rsa
blob
Publickey blob as raw binary data
Note: The publickey subsystem is used for managing publickeys on a server to which the client is already authenticated. To authenticate to a remote system using publickey authentication, use the ssh2_auth_pubkey_file() function instead.