10 items Object-oriented PHP: concepts, techniques, and code / Peter Lavin. p. cm. Includes index. ISBN 1. PHP (Computer program language). Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page Page 12 O'Reilly - Head First. All about Object-Oriented PHP: Concepts, Techniques, and Code by Peter Lavin. LibraryThing is a cataloging and social networking site for booklovers.
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Readers can find many titles and maybe have their own list but one that must be in the top list even their library is PDF Object-Oriented PHP. The hardest thing to learn (and teach btw,) in object oriented PHP is the OOP is all about creating modular code, so our object oriented PHP code will be be wondering why should you even bother to learn object oriented concepts . OBJECT-ORIENTED. PHP. Concepts, Techniques, and Code by Peter (This isn't directly related to object-oriented programming [OOP], but if.
The relationship takes the form of a parent and child.
The child uses the methods defined in the parent class. The main purpose of inheritance is; Re-usability— a number of children, can inherit from the same parent. This is very useful when we have to provide common functionality such as adding, updating and deleting data from the database. Polymorphism — this is concerned with having a single form but many different implementation ways.
The main purpose of polymorphism is; Simplify maintaining applications and making them more extendable. Inheritance - via the use of extends keyword Polymorphism - via the use of implements keyword Now that we have the basic knowledge of OOP and how it is supported in PHP, let us look at examples that implement the above principles What is UML? UML produces a number of documents, but we will look at the class diagram which is very important to object oriented php programming.
Lavin P. Object-Oriented PHP: Concepts, Techniques, and Code
Below are the rules for creating a class in PHP. We will start with identifying the features that are common to all animals. All animals belong to a family such as a herbivore, carnival, etc.
Object-oriented programming OOP OOP is a design philosophy that uses objects and methods rather than linear concepts of procedures and tasks procedural programming to accomplish programmatic goals. An object is a self-sustainable construct that enables re-usability of code. A method specifies one operation without providing any details to describe how the operation should be carried out.
Advantages of OOP Object-oriented programming OOP has some advantages over procedural programming: modularity, code re-usability, information hiding, and debugging ease. Modularity OOP provides a clear modular structure for programs.
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Modularity refers to the concept of making multiple modules first and then linking and combining them to form a complete system. Modularity enables re-usability and minimizes duplication. Here we have created three objects and these objects are independent of each other and they will have their existence separately.
Next we will see how to access member function and process member variables.
After creating your objects, you will be able to call member functions related to that object. One member function will be able to process member variable of related object only.
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Following example shows how to set title and prices for the three books by calling member functions. Constructor Functions are special type of functions which are called automatically whenever an object is created.
So we take full advantage of this behaviour, by initializing many things through constructor functions. You can pass as many as arguments you like into the constructor function.
Following example will create one constructor for Books class and it will initialize price and title for the book at the time of object creation. Now we don't need to call set function separately to set price and title. We can initialize these two member variables at the time of object creation only.
You can release all the resources with-in a destructor. PHP class definitions can optionally inherit from a parent class definition by using the extends clause. Automatically has all the same member functions as the parent, which by default will work the same way as those functions do in the parent. Function definitions in child classes override definitions with the same name in parent classes.
In a child class, we can modify the definition of a function inherited from parent class. Unless you specify otherwise, properties and methods of a class are public.
Till now we have seen all members as public members. If you wish to limit the accessibility of the members of a class then you define class members as private or protected. By designating a member private, you limit its accessibility to the class in which it is declared.
The private member cannot be referred to from classes that inherit the class in which it is declared and cannot be accessed from outside the class. A protected property or method is accessible in the class in which it is declared, as well as in classes that extend that class.Quick Links site.
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Facebook Twitter Reddit LinkedIn. However, many experts in OO development encourage programmers to adhere to encapsulation principles by not calling properties directly , even in languages that allow it.
Webbots, Spiders, and Screen Scrapers: A method specifies one operation without providing any details to describe how the operation should be carried out. It is not legal to have abstract function definitions inside a non-abstract class.
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As you can see in the above figure, there is a parent class- BowlerClass and it has three child classes: FastPacer, MediumPacer and Spinner.