const DEFAULT_URL = 'https://kidsplace.firebaseio.com/';
const DEFAULT_TOKEN = 'MqL0c8tKCtheLSYcygYNtGhU8Z2hULOFs9OKPdEp';
const DEFAULT_PATH = '/firebase/example';

$firebase = new \Firebase\FirebaseLib(DEFAULT_URL, DEFAULT_TOKEN);

// --- storing an array ---
$test = array(
    "foo" => "bar",
    "i_love" => "lamp",
    "id" => 42
);
$dateTime = new DateTime();
$firebase->set(DEFAULT_PATH . '/' . $dateTime->format('c'), $test);

// --- storing a string ---
$firebase->set(DEFAULT_PATH . '/name/contact001', "John Doe");

// --- reading the stored string ---
$name = $firebase->get(DEFAULT_PATH . '/name/contact001');

// -- Firebase API commands

$firebase->set($path, $value);   // stores data in Firebase
$value = $firebase->get($path);  // reads a value from Firebase
$firebase->delete($path);        // deletes value from Firebase
$firebase->update($path, $data); // updates data in Firebase
$firebase->push($path, $data);   // push data to Firebase

// -- Query Parameters can be optionally used on all operations, example:

$value = $firebase->get($path, array('shallow' => 'true'));

// -- Query Parameter values with quotes, example (https://firebase.google.com/docs/database/rest/retrieve-data#filtering-by-a-specified-child-key):

$value = $firebase->get($path, array('orderBy' => '"height"'));

// -- Firebase PHP Library commands

$firebase->setToken($token);     // set up Firebase token
$firebase->setBaseURI($uri);     // set up Firebase base URI (root node)
$firebase->setTimeOut($seconds); // set up maximum timeout / request

public function setFirebaseValue($path, $value) {
  $firebase = new Firebase('https://radiant-fire-2427.firebaseio.com', 'czvEX8vMU8FZn4wYCvf466P3J6zH5ZlKQeuwxmEZ');
  $firebase->set($path, $value);
}

public function setFirebaseValue($path, $value, $firebase) {
  $firebase->set($path, $value);
}

<?php
  require_once '<path>/lib/firebaseInterface.php';
  require_once '<path>/lib/firebaseStub.php';

  class MyClass extends PHPUnit_Framework_TestCase
  {
    public function testSetFirebaseValue() {
      $myClass = new MyClass();
      $firebaseStub = new FirebaseStub($uri, $token);
      $myClass->setFirebaseValue($path, $value, $firebaseStub);
    }
  }
?>