Description:
------------
---
From manual page: http://www.php.net/language.oop5.constants
---

//Simulate Struct
class VolumeWeight
{
    const GRAMS = 'gm';
    const MILILITRE = 'ml';    
}

- or -

class VolumeWeight
{
    public static $GRAMS = 'gm';
    public static $MILILITRE = 'ml';    
}

Then have another (extended) struct

class WaterBottle
{
    public static $ITEM_ID = 1324;
    public static $ITEM_COST = 0.23;

    public static $UNIT = VolumeWeight::$MILILITRE; //Yields an error

}

- BUT -

class WaterBottle
{
    public static $ITEM_ID = 1324;
    public static $ITEM_COST = 0.23;

    public static $UNIT = VolumeWeight::MILILITRE; //Works (from constant class)

}

- AND -

class WaterBottle
{
    const ITEM_ID = 1324;
    const ITEM_COST = 0.23;

    const UNIT = VolumeWeight::MILILITRE; //Error (from constant class)
}

How weird is that? Anything I can do?