Constant Members And Static Members In PHP

Constant Members And Static Members In PHP

Constant Members And Static Members In PHP :

Constant member datas:

A member data of a class whose value be changed or that cannot assigned is called as a constant member data.

1.      A constant member data should not be prefered with ‘$’ sign and it should not be explicitely access specified.

2.      A constant member data should be declared by using the keyword const.

3.      A constant member data connot be invoked by an instance of a class, it can be invloked by the class name with scope resolution operator(::).

Static members:

1.      Declasing class member data or methods as “static” makes them accessible without an instance /object of the class.

2.      A member data declared as static in a class cannot be accessed with an instantiated class object where as a static method can be invoked.

3.      The static methods are callable without an instance of the class created so that the pseudo variable $this is not available inside the method declared as static.

4.      Static members are declared by using the keyword static.

       

<?php

class myclass

{

    const name="india tech";

    public static $age = 25;

    static function myfun()

    {

        echo "inside static function<br>";

    }

}

?>

<h1>

    <?php

    $obj = new myclass();

    echo $obj->name."<br>";

    echo myclass::name."<br>";

    echo $obj->age."<br>";

    echo myclass::$age."<br>";

    $obj->myfun();

    myclass::myfun();

    ?>

</h1>

OutPut:

india tech

25

inside static function

inside static function