<?php
class Human {

   var $heartBeat;// bool hearth beating (true -> live, false -> dead)
   var $weight;
   var $energy;
   var $dialyCalories;

   function __construct($heartBeat)
   {
       $this->heartBeat = $heartBeat;
       $this->weight = 3500; // weight when born
       $this->energy = 50; //energy
       $this->dialyCalories = 20;//statr calories
   }

   function is_alive()
   {
		return $this->heartBeat;
   }

   function dead()
   {
		$this->heartBeat = false;
   }

   function get_energy()
   {
		return $this->energy;
   }

   function eat()
   {
       $this->weight += 300;
       $this->dialyCalories += 700;
	   $this->energy += 10;
   }

   function drink()
   {
       $this->weight += 200;
	   $this->dialyCalories += 10;
	   $this->energy += 5;
   }

   function sleep()
   {
       $this->weight -= 300;
	   $this->dialyCalories -= 2000;
	   $this->energy += 40;
   }

   function is_hungry()
   {
		return $this->dialyCalories;
   }

   function stress()
   {
		$this->energy -= 25;
   }

   function decrease_energy($decreaseFactor)
   {
		$this->energy -= $decreaseFactor;
   }

   function work()
   {
       $this->weight -= 300;
	   $this->dialyCalories -= 500;
	   $this->energy -= 30;
   }

   function getWeight()
   {
		return $this->weight;
   }
}

$one = true;
$two = true;
$tree = true;
$man = new Human(true);

while ($man->is_alive())
{
	if($man->is_hungry() < 2500)
	{
		$man->eat();
		$man->drink();
	}
	else
	{
		$man->sleep();
		$man->eat();
		$man->drink();
	}
	$man->work();
	$man->stress();

	if(getWeight() < 40000)
	{
		if($one)
		{
			$one = false;
			$man->decrease_energy(10);
		}
	}

	if(getWeight() < 60000)
	{
		if($two)
		{
			$two = false;
			$man->decrease_energy(15);
		}
	}

	if(getWeight() < 80000)
	{
		if($tree)
		{
			$tree = false;
			$man->decrease_energy(15);
		}
	}

	if(getWeight() > 100000)
	{
		if($man->get_energy() < 10)
		{
			$man->dead();
		}
	}
}