<?php
    class User{
        private $name;
        private $age;

        public function getName(){
            return $this -> name;
        }
        public function setName($name){
            if(preg_match("#.{3,}#",$name)){
                $this -> name = $name;
            }
        }
        public function getAge(){
            return $this -> age;
        }
        public function setAge($age){
            $this -> age = $age;
        }
    }
    class Student extends User{
        private $kurs;

        public function getKurs(){
            return $this -> kurs;
         }
        public function setKurs($kurs){
            $this -> kurs = $kurs;
        }
        public function addOneYear(){
            $this -> age++;
        }
        public function setName($name){
            if(preg_match("#.{0,10}#",$name)){
                parent::setName($name);
            }
        }
    }
    $student = new Student;
    $student -> setName("aaaaaaaaaaaaaaaa");
    echo $student -> getName();
?>