What is the purpose of abstract classes?

Posted by SpikETidE on Stack Overflow See other posts from Stack Overflow or by SpikETidE
Published on 2010-02-18T12:15:34Z Indexed on 2010/06/16 2:42 UTC
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oop

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interface

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abstract-class

I am trying to learn OOP in PHP, and I have some confusion about interfaces and abstract classes. They both contain no implementations, only definitions, and should be implemented through their sub-classes. What part of abstract classes clearly distinguishes them from interfaces? Also, due to their apparent similarities, based on what reasons should I decide to use one over the other?

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