One long class or many shorter classes?

Question

In PHP, is there any performance impact on using one long class with a lot of functions in it? Or is it advisable to use many small classes and call them separately when needed?

Answer 1

First, think about clean OOP design.

Very long classes with a lot of methods and properties are very difficult to understand.

A set of well-designed classes with meaningful class names, method names and variable names are very easy to understand especially when it comes to maintenance period.