$firebase = new \Firebase\Client('https://test123.firebaseio.com');

$firebase->set([ 'messages' => [] ]);

$messagesRef = $firebase->child('/messages');

$messagesRef->push('Foo');
$messagesRef->push('Bar');
$messagesRef->push('Hello World');

$token = 'TOKEN_IN_HERE';

$firebase = new \Firebase\Client('https://test123.firebaseio.com',$token);

$firebase->child('/users/ron/email').set('ron@test.com');

// Set
$firebase->child('/users/ron')->set([ 'id' => 1,'name' => 'Ron' ]);

// Update
$firebase->child('/users/ron/name')->set('Ronald');

// Push
$likes = $firebase->child('/users/ron/likes');
$likes->push('PHP');
$likes->push('Laravel');
$likes->push('Firebase');

// Get
$user = $firebase->child('/users/ron')->get();

// Delete
$firebase->child('/users/ron')->delete();