PHP: are classes in classes possible? static returns

Question

I am creating a constant mirror of my Database so i don't have problems with typo's anymore.

what i was hoping to achieve is to brouwse trough it in a folder like structure. like:

echo Db::categorie::id;  // should return Cat_ID

is this possible, or something simmilar? now it gives errors because it is not possible. below the code:

class Db // database
{
    /*@var $categorie DbCatergorie*/
    const categorie = DbCatergorie;
}

class DbCatergorie // table in database
{
    Const id = "Cat_ID";
    Const name = "Cat_Name";
    Const imgId = "Cat_Img_ID";
    Const volgorde = "Cat_Volgorde";
}

thx Matthy

class constants cannot be variables, properties, the results of a mathematical operation, or a function call... or classes. You'd be better off defining a static property. — Mark Baker
– Mark Baker, Commented Feb 5, 2012 at 22:47

Shiplu Mokaddim · Accepted Answer · 2012-02-05 22:58:14Z

2

This is not possible.
Class constants must be a constant. Not even constant expressions are supported.

From manual

The value must be a constant expression, not (for example) a variable, a property, a result of a mathematical operation, or a function call.

// Wrong!
class C{
    const c = 54*34;
}

If you are worried about typo, I suggest this,

class Db // database
{
    Const CAT_ID = "Cat_ID";
    Const CAT_NAME = "Cat_Name";
    Const CAT_IMG_ID = "Cat_Img_ID";
    Const CAT_VOLGORDE = "Cat_Volgorde";
}

edited Feb 5, 2012 at 22:58

answered Feb 5, 2012 at 22:52

Shiplu Mokaddim

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