Oopsinphp
- 2. PAPER NAME : PROGRAMMING IN PHP STAFF NAME : MS.V.SHANTHI M.SC,M.PHIL,M,TECH,PGDCA. CLASS : III BCA SEMESTER : VI
- 3. Object oriented programming PHP is a server side scripting language, mainly used for web development but also used as a general proposition programming language. Object Oriented Programming, is a type of programming language principle added to php , that helps in building complex, reusable web applications.
- 4. OBJECT ORIENTED CONCEPTS • Class • Object • Member Variable • Member Function • Inheritance • Parent Class • Child Class • Polymorphism • Data Abstraction • Encapsulation • Constructor • Destructor
- 5. Class: This is a programmer defined data type which inject local functions as well as local data. You can think of a class as a template for making many specimen of the same kind of object.
- 6. Object: An single instance of the data structure defined by a class. You define a class once and then make many objects that befit to it. Objects are also known as specimen.
- 7. Member Variable: These are the variables defined inside a class. This data will be insensible to the outside of the class and can be accessed via member functions. These variables are called virtue of the object once an object is created.
- 8. Member function : These are the function clear inside a class and are used to admission object data. Inheritance: When a class is defined by inheriting current function of a parent class then it is called inheritance. Here child class will receive all or few member functions and variables of a parent class.
- 9. Parent class: A class that is inborn from by another class. This is also called a base class or super class. Child class: A class that receives from another class. This is also called a subclass or derived class.
- 10. Polymorphism: This is an object oriented idea where same function can be used for dissimilar purposes. For example function name will remain same but it take different number of clash and can do different task. Overloading: A type of polymorphism in which some or all of operators have different implementations build upon on the types of their arguments. Build upon functions can also be overloaded with different implementation.
- 11. Data Abstraction: Any representation of data in which the implementation details are occult. Encapsulation: Refers to a idea where we encapsulate all the data and member functions constant to form an object.
- 12. Constructor: Refers to a exceptional type of function which will be called spontaneously whenever there is an object formation from a class. Destructor: Refers to a exceptional type of function which will be called spontaneously whenever an object is deleted or goes out of scope.
- 13. PHP: Inheritance • Inheritance is a well-established programming principle. • Inheritance allows classes to form a hierarchy like a family tree. • Allows subclasses to share the techniques and belongings (which are public or protected) of its superclass. • Superclass is the parent class. • A subclass can add properties and methods. • Inheritance allows reusing code.
- 14. PHP: Inheritance
- 15. INTERFACES: An interface is a explanation of the actions that an entity can do. Interface is written in the similar way as the class the statement with interface keyword.
- 16. Rules of Interfaces: • All methods professed in an interface must be public; this is the nature of an interface. • All methods in the interface must be applied within a class; failure to do so will result in a fatal error. • The class applying the interface must use the exact same technique signatures as are defined in the interface • Interfaces can be prolonged like classes using the spreads operator.
- 17. Abstract Classes: An abstract class is a class that contains at least one abstract technique. The abstract technique is function declaration without anybody and it has the only name of the technique and its parameters. There can be any number of techniques in the class and we have to announce the class as abstract only when there is an abstract method
- 18. PHP: Interfaces • Provides methods to implement. • Derived classes may implement more than one interface. • Interfaces may succeed to from other interfaces using the extends keyword. • All techniques are supposed to be public in the interface definition can be defined explicitly as public or implicitly. • When a class equipment multiple interfaces there cannot be any naming collision between methods defined in the different interfaces.
- 19. PHP: Object Cloning • Cloning is used to produce a copy of an object. • An entity copy is produced by using the clone keyword. • When an entity is cloned, PHP 5 will perform a shallow copy of all of the object's properties. • PHP affords a special method __clone to copy an object. • Once the cloning is complete, if a __clone() method is defined, then the newly created object's __clone() method will be called, to allow any necessary properties that need to be changed.