Failed to send Push Notification

Question

I try to send a message, but get nothing. Although no fails, when printing the variable:

$result

this returns \"to\" (I have no idea why).<

Answer 1

$data and $registration_id must be an array to work with push notifications. so it should be like.

$data = array(
    "registration_ids" => array($registration_id),
    "data" => array(
        "body" => $message,
    ),
);