Oops in PHP By Nyros Developer
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This document discusses object-oriented programming (OOP) concepts in PHP. It covers the history of OOP and procedural programming, the benefits of OOP like reusability and security, OOP terminology like classes and objects, and differences between OOP implementations in PHP4 and PHP5 like access modifiers. Advantages of OOP include reusable and maintainable code, while disadvantages include more code required and a learning curve for procedural programmers.
Oops in PHP By Nyros Developer
- 1. OOPs in PHP By Rajkumar
- 2. History of oops. What is oop system,Why do we have to use oops? Benfits of oops. Oop terminology. Oops in php4 and php5. Advantages and disadvantages of oops Concepts
- 3. History of oops Procedural language: The traditional programming that is based on algorithms or a logical step-by-step process for solving a problem. Web service is a platform independent.The focus of procedural programming is to break down a programming task into a collection of variables, data structures, and subroutines, whereas .The most important distinction is whereas procedural programming uses procedures to operate on data structures, object-oriented programming bundles the two together so an "object" operates on its "own" data structure .
- 4. History of oops Object oriented programming: in object-oriented programming it is to break down a programming task into objects with each "object" encapsulating its own data and methods (subroutines). The most important distinction is whereas procedural programming uses procedures to operate on data structures, object-oriented programming bundles the two together so an "object" operates on its "own" data structure.
- 5. What is oop system? Main goal of oops is everything you want to do, do it in objects. Objects are basically small discrete pieces of code which,can incorporate data and behaves together. Oop system fallows bottom-up approach and divide & con-quire rule.
- 6. Features of oop system Encaptulation: Encapsulation is the technique of making the fields in a class private and providing access to the fields via public methods. If a field is declared private, it cannot be accessed by anyone outside the class,thereby hiding the fields within the class. For this reason, encapsulation is also referred to as data hiding. Inheritence. Inheritance is the capability of a class to use the properties and methods of another class while adding its own functionality.
- 7. Polymorphism. Polymorphism is the ability of an object to take on many forms. The most common use of polymorphism in OOP occurs when a parent class reference is used to refer to a child class object. Abstraction: Abstraction refers to the ability to make a class abstract in OOP. An abstract class is one that cannot be instantiated. All other functionality of the class still exists, and its fields, methods and constructors are all accessed in the same manner. You just cannot create an instance of the abstract class.
- 8. Benfits of oops Security. Re usability Maintainability Portability. Extendability. Scalability. Efficiency
- 9. Basic terminology Object. Class. Access modifiers(public,private,protected). Access specifiers(static,final). Methods/Functions. Variables/Attributes. Constructor/Destructor.
- 10. Examples <?php class Test{ private $a,$b; protected $x=12,$y=13; function add($a,$b){ $this->a =a; $this->b =b; return $a+$b; } }
- 11. class Test1 extends Test{ function add1(){ return $this->x + $this->y; } } $obj = new Test(); $result = $obj->add(12,15); echo $result; $obj1 = new Test1(); $result1 = $obj1->add1(); echo $result1; ?>
- 13. Oops in php4 and php5 Basic object oriented concepts came in to existence in php3.But it is initiation for real oop. In php4 you can create objects but you can't feel real flavor of objects. Everything is open in php4 (ie:no restrictions about usage of methods/properties). You can't use public,private,protected modifiers for your methods. In php4 the private methods can be declared with __(double underscore).
- 14. Oops in php4 and php5 In php4 you can find interfaces but no abstract or final key word. In php4 you can access the methods without create an object. However it is not valid in php5 because the method echosomething() uses $this keyword which is not available in static call.
- 15. <?php class Abc { var $ab; function abc() { $this->ab = 7; } function echosomething() { echo $this->ab; } } echo abc::echosomething(); ?>
- 16. Oops in php4 and php5 Pass by value is in php4 where as pass by referrence is in php5. Exceptions handling came in to existence in php5. Unified constructor(__construct()) in php5. Exception hadling came in existence in php5.
- 18. Oops in php4 and php5 In php4 you can find interfaces but no abstract or final key word. In php4 you can access the methods without create an object. However it is not valid in php5 because the method echosomething() uses $this keyword which is not available in static call.
- 19. Advantages in OOPS Reusable blocks/code. Since it is in model it is easy to update aspects of your requirements. Allow many programmers on same project. Since it is segmented it allows many programmers to work on same project without fearing of breaking other users code. Good for bigger projects.
- 20. Disadvantages in OOPS It is not used for small projects because for object oriented we might have to write more code which would not be suitable for small projects. Object oriented in php can be little slower at run time. Difficult to learn for programmers used to procedural languages. A new way of thinking is required.
- 21. THANK YOU