the following is my code and I hope anyone who has been doing PHP can help to review or comment for any improvements or weaknesses on my code.

I want to develop my style of code in which copy-and paste is minimum and functionality expandability is rich. for eg : the execute() function in UserDB class..basically the same function can be used widespread in many diff db class, so do I need to copy and paste the code again or should I just moved this piece of code to abstract class  ?

next is the UserFactory class

next is my UserDB class

Next is my Database abstract class.

Last is my User object class

The following is my code and I hope anyone who has been doing PHP can help to review or comment for any improvements or weaknesses on my code.

I want to develop my style of code in which copy-and paste is minimum and functionality expandability is rich. For example, the execute() function in the UserDB class is basically the same function and can be used widespread in many diff db class. Do I need to copy and paste the code again or should I just moved this piece of code to abstract class?

UserFactory class

UserDB class

Database abstract class

User object class

How can I optimized my code to made it better for future functionalities such as other select, insert, update and delete while maintaining readability and still within OOP strandards ?

How can I optimized my code to made it better for future functionalities such as other select, insert, update and delete while maintaining readability and still within OOP standards ?

I want to develop my style of code in which copy-and paste is minimum and functionality expandability is rich. for eg : the execute() function in UserDB class..basically the same function can be used widespread in many diff db class, so do I need to copy and paste the code again or should I just moved this piece of code to abstract class ?

How can I optimized my code to made it better for future functionalities such as other select, insert, update and delete while maintaining readability and still within OOP strandards ?