public function setSSLKey($certificateFile, $password = null)
    {
        if ($password) {
            $this->options[GuzzleRequestOptions::SSL_KEY] = [$certificateFile, $password];
        } else {
            $this->options[GuzzleRequestOptions::SSL_KEY] = $certificateFile;
        }
    }
public function setSSLKey($certificateFile, $password = null)
    {
        if ($password) {
            $this->options[GuzzleRequestOptions::SSL_KEY] = [$certificateFile, $password];
        } else {
            $this->options[GuzzleRequestOptions::SSL_KEY] = $certificateFile;
        }
    }
public function setSSLKey ( $ certificateFile , $ password = null ) { if ( $ password ) { $ this -> options [ GuzzleRequestOptions :: SSL_KEY ] = [ $ certificateFile , $ password ] ; } else { $ this -> options [ GuzzleRequestOptions :: SSL_KEY ] = $ certificateFile ; } }
Specify the path to a file containing a private SSL key in PEM format.

@param string $certificateFile
@param null   $password
Specify the path to a file containing a private SSL key in PEM format .