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$url = "http://host/index.php?option1=&option2=128&option3=";
$option3 = 42;

$response = $useragent->get( $url . $option3 );

$url = "http://host/index.php";
$option3 = 42;

...
                  'option2' => 128,
                  'option3' => $option3,
);