var carregarUsuario = function () {
    $http.get("buscar.php").then(function (retorno){
        console.log(retorno.data);
        $scope.usuarios = retorno.data;
    });
};
carregarUsuario();

error_reporting(0);
    $user = "root";
    $password = "";
    $db = "angulardb";
    $host = "localhost";
    $con = mysqli_connect("localhost", $user, $password, $db);
    if (mysqli_connect_errno()){
      echo "Erro: " . mysqli_connect_error();
      }
    $usuario = mysqli_query($con, "SELECT *  FROM users");

        header('Content-Type: application/json');
        $return = array();

        while ($dados = mysqli_fetch_assoc($usuario)) {
            array_push($return, $dados);
        }

        echo json_encode($return);