Server side validation ReCaptcha

example.php

<?php

use App\Exceptions\Validator;

$input = $request->all(); //For example in Laravel
if ($request->method() === 'POST') {
  if ( !Validator::captcha($input['g-recaptcha-response']) ) {
    return "Invalid Captcha :(";
  }
  return "Validated :)";
}

Validator.php

<?php

namespace App\Exceptions;

/**
 * Class Validator to sanitize
 * manually fields from Request.
 * @package App\Exceptions
 */
class Validator extends \Exception
{
    const CAPTCHA_SECRET = YOUR-SECRET-KEY;
    const VERIFY_URL     = 'https://www.google.com/recaptcha/api/siteverify';
    
    /**
     * Validate a Re Captcha.
     *
     * @param   $token
     * @return  bool
     */
    public static function captcha($token)
    {
        if (isset($_SERVER["HTTP_CF_CONNECTING_IP"])) {
            $_SERVER['REMOTE_ADDR'] = $_SERVER["HTTP_CF_CONNECTING_IP"];
        }

        $postData = http_build_query([
            'secret'   => self::CAPTCHA_SECRET,
            'response' => $token,
            'remoteip' => $_SERVER['REMOTE_ADDR']
        ]);
        $opts = [
            'http' => [
                'method'  => 'POST',
                'header'  => 'Content-type: application/x-www-form-urlencoded',
                'content' => $postData
            ]
        ];
        $context  = stream_context_create($opts);
        $response = file_get_contents(self::VERIFY_URL, false, $context);
        $result   = json_decode($response);
        if (!$result->success) {
            return false;
        }

        return true;
    }
}