<?php class person { public $name; public $age; function __construct($n, $a) { $this->name=$n; $this->age=$a; } public function setAge($ag) { $this->ag=$ag; } public function display() { echo "welcome ".$this->name."<br/>"; return $this->age-$this->ag; } } $person=new person("sonoo",28); $person->setAge(1); echo "You are ".$person->display()." years old"; ?>