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