PHP のサーバー側で Google reCAPTCHA v3 を確認するにはどうすればよいですか?

<code class="php">function isValid()
{
    try 
    {
        $url = 'https://www.google.com/recaptcha/api/siteverify';
        $data = [
            'secret'   => '[YOUR SECRET KEY]',
            'response' => $_POST['g-recaptcha-response'],
            'remoteip' => $_SERVER['REMOTE_ADDR']
        ];

        $options = [
            'http' => [
                'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
                'method'  => 'POST',
                'content' => http_build_query($data)
            ]
        ];

        $context  = stream_context_create($options);
        $result = file_get_contents($url, false, $context);
        return json_decode($result)->success;
    }
    catch (Exception $e) 
    {
        return null;
    }
}</code>

if (isValid()) {
  // The user has passed the captcha validation.
} else {
  // The user has failed the captcha validation.
}