public function store($public_key_file, $private_key_file)
    {
        file_put_contents($public_key_file, $this->public_key_text);
        file_put_contents($private_key_file, $this->private_key_text);
        chmod($private_key_file, 0600);

        return $this;
    }
public function store($public_key_file, $private_key_file)
    {
        file_put_contents($public_key_file, $this->public_key_text);
        file_put_contents($private_key_file, $this->private_key_text);
        chmod($private_key_file, 0600);

        return $this;
    }
public function store ( $ public_key_file , $ private_key_file ) { file_put_contents ( $ public_key_file , $ this -> public_key_text ) ; file_put_contents ( $ private_key_file , $ this -> private_key_text ) ; chmod ( $ private_key_file , 0600 ) ; return $ this ; }
Store the keys into files.

@param string $public_key_file
@param string $private_key_file

@return KeyPair provides a fluent interface
Store the keys into files .