[php] How to Validate Google reCaptcha on Form Submit

Verify Google reCapcha is valid or not after form submit

if ($post['g-recaptcha-response']) {
      $captcha = $post['g-recaptcha-response'];
      $secretKey = 'type here private key';
      $response = file_get_contents("https://www.google.com/recaptcha/api/siteverify?secret=" . $secretKey . "&response=" . $captcha);
        $responseKeys = json_decode($response, true);
        if (intval($responseKeys["success"]) !== 1) {
            return "failed";
        } else {
            return "success";
        }
    }
    else {
        return "failed";
    }

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