Re: Multiple class inheritance

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 >