Google recaptcha v2 validation server side implementation in PHP

g-recaptcha.php

public function validate($response = "captcha token generated from client side")
    {
        $url = "https://www.google.com/recaptcha/api/siteverify";
        $data = [
            'secret' => 'google_site_secret',
            'response' => $response
        ];

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

        $context = stream_context_create($options);
        $response = file_get_contents($url, false, $context);

        $response = json_decode($response, true);
        return !!$response['success'];
    }