Google's reCAPTCHA verification - php

Question

I'm a newbie in web development (or development) and I'm using Laravel (if it matters somehow). I have a reCAPTCHA in my form. It works, but now I have to verify user's keyword in recaptcha.
Documentation: https://developers.google.com/recaptcha/docs/verify sounds simple, but somehow I can't write the code lines for verification. I was looking for some examples, but they're not for Laravel but for pure PHP, and I didn't see where is the 'https://www.google.com/recaptcha/api/siteverify?secret=your_secret&response=response_string&remoteip=user_ip_address' URL used in the examples.
My controller is:
public function postMessage() {
require_once('recaptchalib.php');
$privatekey = "MY_PRIVATE_KEY";
?????
// this should be executed only after validation
DB::table('messages')->insert(['name' => Input::get('name'),
'email' => Input::get('email'),
'message' => Input::get('message'),
'datetime' => \Carbon\Carbon::now()->toDateTimeString()]);
So please, instruct me, how could i get JSON object with response, or what should I write instead of ?????

Answer 1

Well, at the end I was able to find solution by myself:
public function postMessage() {
$secret = '7LdL3_4SBAAAAKe5iE-RWUya-nD6ZT7_NnsjjOzc';
$response = Input::get('g-recaptcha-response');
$url = 'https://www.google.com/recaptcha/api/siteverify?secret='.$secret.'&response='.$response;
$jsonObj = file_get_contents($url);
$json = json_decode($jsonObj, true);
if ($json['success']==true) {
DB::table('messages')->insert(['name' => Input::get('name'),
'email' => Input::get('email'),
'message' => Input::get('message'),
'datetime' => \Carbon\Carbon::now()->toDateTimeString()]);
return Redirect::route('contact')->with('okmessage', 'Ďakujeme. Vaša správa bola odoslaná');
} else {
return Redirect::route('contact')->with('errormessage', 'Chyba! Zaškrtnite "Nie som robot" a zadajte správny kód.');
}
}