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  • How to create a class and object in php

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     class rect
    {
       public $length=0;
    public $width=0;
    public $area=0;
    public function getData()
    {
    $this->length=10;
    $this->width=20;
    }
    public function area()
    {
    $this->area = $this->length * $this->width;
    }
    public function showArea()
    {
    echo "Area of $this->length and $this->width is $this->area";
    }
    }
    $rect = new rect();
    $rect->getData();
    $rect->area();
    $rect->showArea();
    ?>

    What is a class?
    A class represents an object, with associated methods and variables.
    Class is nothing without creating an object.To create a class we use keyword 'class'. Class Definition is Similar to defining a function......The definition does not do anything by itself. It is a blueprint, or description, of an object. To do something, We need to use the class.

    An example class definition for a rect:-
    The rect object has three attributes, length, width and area and can perform the action of area.
    Use of $this in a class:- The $this is a built-in variable (built into all objects) which points to the current object. Or in other words, $this is a special self-referencing variable. we use $this to access properties and to call other methods of the current class.

    Instantiate/create your object:-
    Classes are the blueprints/templates of php objects. Classes don't actually become objects until you do something called: instantiation.

    The 'new' keyword:-
    To create an object out of a class, you need to use the 'new' keyword.


    Steps:-

     class rect {           // Define the name of the class.
    public $length; public $width; public $area; // Define an object of attribute (variables) the length and width of a rectangle.


    public function getData(), public function area() and public function showArea() are object actions (functions).

    • }              //End the class definition. 

  • $rect = new rect(); 
          //Create a new instance of the class Or new object of the class.

  • $rect->getData(); $rect->area(); and $rect->showArea(); 
    //Use the rect object and methods getData(), area() and showArea().
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