In this tutorial we will see the visibility of the properties/methods of Objects of the same class, wherein same type of objects can access each other's protected/private members and also both the instances are not same. Let us create a file test.php

Example

class testObject
{
    private $abc;

    public function __construct($xyz)
    {
        $this->abc=$xyz;
    }

    private function bar()
    {
        echo 'This is a private method of any object that belongs to the class testObject.';
    }

    public function baz($any)
    {

        //Here we are changing the value of private property of an object:

        var_dump($any->abc);echo '<br>';
        $any->abc='Hello World ';
        var_dump($any->abc);echo '<br>';

        //Another object $any calls the private function of class testObject
        $any->bar();
    }
}

$test = new testObject('xyz123'); //parameter passed to the constructor of class testObject

//Here an object "$test" calls the public function "baz" wherein we call the private function of another object i.e. "$any" of same class.

$test->baz(new testObject('other123'));

OUTPUT:

string(8) "other123"
string(12) "Hello World "
This is a private method of any object that belongs to the class testObject.