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To: Larry Garfield <larry@garfieldtech.com>
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Date: Mon, 19 Nov 2007 01:14:32 -0500
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Subject: Re: [PHP-DEV] Multiple class inheritance
From: sam@sambarrow.com (Sam Barrow)

I was considering something like this, just seems like more of a hack to
me than the right way to do it, plus the performance hit you mentioned.

On Mon, 2007-11-19 at 00:11 -0600, Larry Garfield wrote:
> (Sorry, hit reply too soon.)
> 
> Or, alternatively, you can mostly implement "friend" functions of a sort:
> 
> http://www.garfieldtech.com/blog/php-magic-call
> 
> but they have a performance penalty:
> 
> http://www.garfieldtech.com/blog/magic-benchmarks
> 
> On Sunday 18 November 2007, Sam Barrow wrote:
> > What is the general opinion on multiple class inheritance. I have a need
> > for it. I have objects for all user input fields.
> >
> > $username = new field ;
> > $username -> name = 'username' ;
> > $username -> maxLen = 32 ;
> >
> > I have three types of fields. Fields that are automatically put in the
> > database, such as timestamps, fields that are inputted but not stored,
> > such as "confirm password", and fields that are inputted by the user AND
> > stored in the database, such as username and password.
> >
> > Now i have 3 classes:
> >
> > - abstractField (has methods and properties that apply to all fields).
> > - inputField, extends abstractField (has methods and properties for
> > display of input form elements and labels).
> > - dbField, extends abstractField (has methods for storing and retrieving
> > in db, etc.).
> >
> > However for fields that are inputted AND stored in the db, i need to
> > extend both inputField and dbField.
> >
> > - inputDbField extends inputField, dbField.
> >
> > Sure, there may be quick hacks to do this, but the only proper way seems
> > to be to extend both classes, and I don't want to duplicate any code
> > (dbField and inputField are both pretty big, and any modifications will
> > also have to be replicated).
> >
> > And no, I don't want to use interfaces. Interfaces will barely do
> > anything for me, I'll still have to duplicate my method bodies, and
> > properties.
> 
> 
> -- 
> Larry Garfield			AIM: LOLG42
> larry@garfieldtech.com		ICQ: 6817012
> 
> "If nature has made any one thing less susceptible than all others of 
> exclusive property, it is the action of the thinking power called an idea, 
> which an individual may exclusively possess as long as he keeps it to 
> himself; but the moment it is divulged, it forces itself into the possession 
> of every one, and the receiver cannot dispossess himself of it."  -- Thomas 
> Jefferson
>