public Collection<V> values() {
        if (values == null) {
            values = new Values(this);
        }
        return values;
    }
Gets the values view of the map.
Changes made to the view affect this map.
To simply iterate through the values, use {@link #mapIterator()}.

@return the values view
jphp-runtime/src/php/runtime/common/collections/map/AbstractHashedMap.java