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Class and Objects in PHP

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The document discusses object-oriented programming concepts in PHP, including classes, objects, methods, properties, inheritance, and polymorphism. It provides examples of defining classes and using them to instantiate objects. Key concepts covered are class definitions, creating object instances, accessing object properties and methods, inheritance between classes, and overriding methods in child classes.

EducaciónTecnología
1 de 38
PHP Classes and Object Orientation
Reminder… a function ,[object Object],[object Object],[object Object],[object Object],[object Object]
Conceptually, what does a function represent? … give the function something (arguments), it does something with them, and then returns a result… Action or Method
What is a class ? ,[object Object]
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],An example class definition for a dog. The dog object has a single attribute, the name, and can perform the action of barking.
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],class dog { Define the name of the class.
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],public $name; Define an object attribute (variable), the dog’s name.
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],public function bark() { echo ‘Woof!’ ; } Define an object action (function), the dog’s bark.
Class Definition ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],} End the class definition
Class Defintion ,[object Object],[object Object]
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],require ( ‘dog.class.php’ ); Include the class definition
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],$puppy = new dog(); Create a new instance of the class.
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],$puppy->name = ‘Rover’ ; Set the name variable of this instance to ‘Rover’.
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],echo “ {$puppy->name} says ” ; Use the name variable of this instance in an echo statement..
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],$puppy->bark(); Use the dog object bark method.
Class Usage ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[example file: classes1.php]
One dollar and one only… ,[object Object],[object Object],[object Object]
Using attributes within the class.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Constructor methods ,[object Object],[object Object],[object Object]
Constructor Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Constructor function
Constructor Example ,[object Object],[object Object],[object Object],[object Object],[object Object],Constructor arguments are passed during the instantiation of the object.
Class Scope ,[object Object],[object Object]
Inheritance ,[object Object],dog poodle alsatian parent children
Inheritance ,[object Object],[object Object]
Inheritance example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Inheritance example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],class poodle extends dog { Note the use of the extends keyword to indicate that the poodle class is a child of the dog class…
Inheritance example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
…a poodle will always ‘Yip!’ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Child Constructors? ,[object Object],[object Object],[object Object],[object Object]
Objects within Objects ,[object Object],[object Object],… $puppy = new dog; $puppy->name = “Rover" ; $poppy->tag = new dogtag; $poppy->tag->words = “blah” ; …
Deleting objects ,[object Object],[object Object]
A copy, or not a copy.. ,[object Object],[object Object]
Why Object Orientate? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Object Orientate? ,[object Object],[object Object],[object Object]
Why Object Orientate? ,[object Object],[object Object],[object Object]
There is a lot more… ,[object Object],[object Object],[object Object]
PHP4 vs. PHP5 ,[object Object],[object Object],[object Object],[object Object]

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Class and Objects in PHP

  • 1. PHP Classes and Object Orientation
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