static meber vs non-static member

[Liquid Fire]

As i am developing my framework and trying to think of any speed issue to get as much as i can I stated to think about my static members in my base class.  right now I have a static instance of my database, url_helper, session, and configuration classes.  Now all of these classes bug the database class is a singleton class.  is there any speed difference from using a static member of a singleton class.  I know a common way of loading classes like these are to load them dynamically from an array in the constructor however, unless i am mistaken, those variables are than public to access outside of the class which breaks encapsulation(I am a firm believer that data should always been hidden from the rest of the code and only accessible thought accesser functions).  Now that being said is there any speed difference from static to non-static members with singleton classes?

[Jenk]

If the value is a value that is shared amongst all objects of that class, and must be the same amongst all instances, or is for use within static methods, then it should be static, or perhaps constant if the value never changes. If the value is individual for each instance, then it must be non-static.

[448191]

Now that being said is there any speed difference from static to non-static members with singleton classes?

 

Not much, I reckon. Do some benchmarks and find out for yourself.