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The most popular and developed model of OOP is a class-based model, as opposed to an object-based model. In this model, objects are entities that combine ''[[State (computer science)|state]]'' (i.e. data), ''[[behavior]]'' (i.e. procedures, or ''[[method (computer science)|method]]s'') and ''[[identity (object-oriented programming)|identity]]'' (unique existence among all other objects). The structure and behavior of an object are defined by a [[class (object-oriented programming)|class]], which is a [[definition]], or [[blueprint]], of all objects of a specific type. An object must be explicitly created based on a class and an object thus created is considered to be an [[Instantiation (computer science)|instance]] of that class. An object is similar to a [[Data structure|structure]], with the addition of method pointers, member access control, and an implicit data member which locates instances of the class (i.e. actual objects of that class) in the class hierarchy (essential for runtime inheritance features).
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|quote = Object-oriented programming is more than just classes and objects; it's a whole programming paradigm based around ''objects'' (data structures) that contain data fields and methods. It is essential to understand this; using classes to organize a bunch of unrelated methods together is not object orientation.
|author = Junade Ali
|source = ''Mastering PHP Design Patterns''<ref>{{cite book|last1=Ali|first1=Junade|title=Mastering PHP Design Patterns {{!}} PACKT Books|date=Packt Publishing Limited|___location=Birmingham, England, UK|isbn=978-1-78588-713-0|page=11|edition=1|url=https://www.packtpub.com/application-development/mastering-php-design-patterns|accessdate=11 December 2017|language=en}}</ref>
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==Encapsulation==
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