<?php

class People
{
    private $name;
    private $age;
    private $growth;
    private $weight;

    public function __construct($name, $age, $growth, $weight) {
        $this->name = $name;
        $this->age  = $age;
        $this->growth = $growth;
        $this->weight = $weight;
    }

    public function tellAboutYourself() {
        echo 'Hello, my name is ', $this->name,
              ". I'm ", $this->age, " years old, my growth is ",
              $this->growth, ', weight ', $this->weight;
    }
}

class Kate extends People
{
    private $insalubrityLevel;

    public function __construct($age, $growth, $weight, $insalubrityLevel) {

        if ($insalubrityLevel < 100)
            echo 'Уровень вредности Кати не может быть меньше 100!';

        else if ($growth > 160 || $weight > 55)
            echo 'Вес и рост не должны превышать 55 и 160!';

        else {
            parent::__construct('Катя', $age, $growth, $weight);
            $this->insalubrityLevel = $insalubrityLevel;
        }
    }

    public function tellAboutYourself() {
        parent::tellAboutYourself();
        echo '. My insalubrity level is ', $this->insalubrityLevel;
    }
}

$Kate = new Kate(19, 159, 44, 999);

$Kate->tellAboutYourself();

// Короч этот весь код выведет:
// Hello, my name is Катя. I'm 19 years old, my growth is 159, weight 44. My insalubrity level is 999

?>