How to check if a class belongs to a certain namespace

You can use get_class() to obtain the class of the object, then you can use strops() on it to find out if it contains the namespace. There isn't an equivalent get_namespace() function.

Example:

function is_in_namespace($namespace, $object) {
    return strpos(get_class($object), $namespace . '\\') === 0;
}

function get_namespace($object) {
    $class = get_class($object);
    $pos = strrpos($class, '\\');
    return substr($class, 0, $pos);
}