Hello Readers,

1. We can use the self in static function while this is not.

2. we can use accessible class variable and methods with self and this are:

for self self::

for this $this->

3. $this needs an instantiated object while self not.

4. self refers to the class in which it is called, while $this refers to the class of the current object.

5. self can also turn off polymorphic behavior by bypassing the vtable while $this not

6. Examples of self anf this :

Example of self in PHP:

<?php 

class Car
{
    public static function model()
    {
         self::getModel();
    }

    protected static function getModel()
    {
        echo "I am a Car";
    }

}

?>

In the above example we use a class Car and make call to the static function in the Car class.

we use the self::getModel() like

Car::model();

So the output of the above program will be:

I am a Car

Another Example of self and this in PHP:

<?php

class ParentClass {
    function test() {
        self::who();    // will output 'parent'
        $this->who();  // will output 'child'
    }

    function who() {
        echo 'parent';
    }
}

class ChildClass extends ParentClass {
    function who() {
        echo 'child';
    }
}

$obj = new ChildClass();
$obj->test();

?>

In this example, we use the both self ad this we use self as a (self::who()) will always output (parent)

while $this used as a ($this->who()) will depend on what class the object has.