如何在cURL中发布带单选按钮的表单？

Form in the server site contains one text box and two radio buttons and a submit button. This is waht I tried. Please help.

        $url = "Url goes here";

        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, "{\"postcode\":\"3150\", \"customerType\":\"Residential\",\"fuelType\":\"Electricity\"}");
        curl_setopt($ch, CURLOPT_POST, 1);

        $headers = array();
        $headers[] = "Content-Type: application/x-www-form-urlencoded";
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

        $result = curl_exec($ch);
        if (curl_errno($ch)) {
            echo 'Error:' . curl_error($ch);
            echo "test";
        }

        echo "<pre>";
        print_r($result);
        echo "</pre>";

        curl_close($ch);
    }

    ?>

It works like for a text value.

Find the name of these radio, check the value you want.

Example :

<form>
    <input type="radio" name="gender" value="male" checked> Male<br>
    <input type="radio" name="gender" value="female"> Female<br>
    <input type="radio" name="gender" value="other"> Other  
</form>

Your cURL Postfield should looks like this :

$data = array('gender' => 'male');
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);