Error in the JSON object in php

Is there any modification when creating or getting a JSON object in PHP?

I have the following code:

Angular:

$scope.atualizaUsuario = function(usuario) {
    $window.localStorage.setItem("nome", usuario.nome);
    $window.localStorage.setItem("usuario", usuario.usuario);
    $window.localStorage.setItem("email", usuario.email);

    var nome = $window.localStorage.getItem("nome", nome);
    var usuario = $window.localStorage.getItem("usuario", usuario);
    var email = $window.localStorage.getItem("email", email);
    var idUsuario = $window.localStorage.getItem("idUsuario", idUsuario);

    usuario = {
        "idUsuario":idUsuario,
        "nome":nome,
        "usuario":usuario,
        "email":email
    }

    $http.put("http://www.vigilantescomunitarios.com/php/atualizaUsuario.php", usuario).success(function (data){
        console.log(data);
        $location.path("/ajustes");
    })
}

Then ...

<?php
$postdata = file_get_contents("php://input");
$request = json_decode($postdata);

$idUsuario = $request->idUsuario;
$name = $request->name;
$usuario = $request->usuario;
$email = $request->email;
$pass = $request->pass;

I ask this question, because in the php logo appears this message:

Does anyone know why this is? Thanks.