object-oriented Programming in PHP: A way to a large PHP project

This article describes object-oriented programming (OOP) in PHP. I'll show you how to use object-oriented concepts to make fewer code but better programs. Good luck to all of you.

The concept of object-oriented programming has a different perspective for each author, and I remind you of what an object-oriented language should be:

-Data abstraction and information hiding

-Inherit

-Polymorphism

Ways to encapsulate a class in PHP:

<?php
class Something {
　　 // In OOP classes are usually named starting with a cap letter.
　　 var $x;
　　 function setX($v) {
　　　　 // Methods start in lowercase then use lowercase to seprate
　　　　 // words in the method name example getValueOfArea()
　　　　 $this->x=$v;
　　 }
　　 function getX() {
　　　　 return $this->x;
　　 }
}
?>

Of course you can use your own method, but there is always a good standard.

The data members of a class in PHP use the "var" definition, and the data members are not typed until they are assigned. A data member may be an integer, an array, a union array (associative array), or even an object. method to define a function in a class, to access data members in a method, you must use a $this->name method, otherwise it is a local variable for a function.

Use new to create an object

$obj = new Something;

Then use the member function

$obj->setx (5);

$see = $obj->getx ();

The SetX member function assigns 5 to the object (instead of the Class) member variable in obj, and then GetX returns the value 5.

You can also use object references to access member variables, such as: $obj->x=6; However, this is not a good object-oriented programming method. I insist. You should use a member function to set the value of a member variable and to read a member variable by using a member function. If you think that member variables are not accessible, in addition to using member functions, you will become a good object-oriented programmer. Unfortunately, PHP itself has no way of declaring that a variable is private, so it allows bad code to exist.

Inheritance in PHP is declared using extend.

<?php
class Another extends Something {
　　 var $y;
　　 function setY($v) {
　　　　 // Methods start in lowercase then use lowercase to seperate
　　　　 // words in the method name example getValueOfArea()
　　　　 $this->y=$v;
　　 }
　　 function getY() {
　　　　 return $this->y;
　　 }
}
?>