Hello, i am a new dev in Laravel 5

Try it

Config in DB Firebase in panel (Google)

After config your Laravel

Require in composer

composer require kreait/firebase-php ^4.0

Or your add manual in file composer.json

"require": { "kreait/firebase-php": "^4.0" }

create your controller

php artisan make:controller FirebaseController

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Kreait\Firebase;
use Kreait\Firebase\Factory;
use Kreait\Firebase\ServiceAccount;
use Kreait\Firebase\Database;

class FirebaseController extends Controller{

public function index(){

$serviceAccount = ServiceAccount::fromJsonFile(__DIR__.'/Laraveltesting-6aeda3a963f2.json');

$firebase = (new Factory)

->withServiceAccount($serviceAccount)
->withDatabaseUri('https://laraveltesting-bd2b9.firebaseio.com/')
->create();

$database = $firebase->getDatabase();
$newPost = $database

->getReference('blog/posts')
->push([
'title' => 'Post title',
'body' => 'This should probably be longer.'
]);

//$newPost->getKey(); // => -KVr5eu8gcTv7_AHb-3-
//$newPost->getUri(); // => https://my-project.firebaseio.com/blog/posts/-KVr5eu8gcTv7_AHb-3-
//$newPost->getChild('title')->set('Changed post title');
//$newPost->getValue(); // Fetches the data from the realtime database
//$newPost->remove();

echo"<pre>";

print_r($newPost->getvalue());
}
}

?>

After set your router

Route::get('/phpfirebase_sdk','FirebaseController@index');

More infos in https://www.cloudways.com/blog/firebase-realtime-database-laravel/

Sorry for my bad english.