Object Oriented Programming With PHP5
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Object Oriented Programming With PHP5

Object Oriented Programming With PHP5

Object-oriented programming (OOP) is a programming paradigm that represents concepts as "objects" that have data fields (attributes that describe the object) and associated procedures known as methods. Objects, which are usually instances of classes, are used to interact with one another to design applications and computer programs. C++ and Java are examples of object-oriented programming languages.


Terminology invoking "objects" and "oriented" in the modern sense of object-oriented programming made their first appearance at MIT in the late 1950s and early 1960s. In the environment of the artificial intelligence group, as early as 1960, "object" could refer to identified items (LISP atoms) with properties (attributes);Alan Kay was later to cite a detailed understanding of LISP internals as a strong influence on his thinking in 1966. Another early MIT example was Sketchpad created by Ivan Sutherland in 1960–61; in the glossary of the 1963 technical report based on his dissertation about Sketchpad, Sutherland defined notions of "object" and "instance" (with the class concept covered by "master" or "definition"), albeit specialized to graphical interaction.[6] Also, an MIT ALGOL version, AED-0, linked data structures ("plexes", in that dialect) directly with procedures, prefiguring what were later termed "messages", "methods" and "member functions".

Just as procedural programming led to refinements of techniques such as structured programming, modern object-oriented software design methods include refinements[citation needed] such as the use of design patterns, design by contract, and modeling languages (such as UML).

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