(PECL ssh2 >= 1.0)
ssh2_disconnect — Close a connection to a remote SSH server
ssh2_disconnect ( resource $session ) : bool
Close a connection to a remote SSH server.
session
An SSH connection link identifier, obtained from a call to ssh2_connect().
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.ssh2-disconnect.php