<?php
	class CPerson
	{
		public function sayHi()
		{
			echo "Person says Hi\r\n";
		}
	}
	
	class CStudent
	{
		public function doHomework()
		{
			echo "Student does homework\r\n";
		}
	}
	
	interface IPerson
	{
		public function sayHi();
	}
	
	interface IStudent
	{
		public function doHomework();
	}
	
	class CParent implements IPerson, IStudent
	{
		private $person;
		private $student;
		
		public function CParent()
		{
			$this->person = new CPerson();
			$this->student = new CStudent();
		}
		
		public function sayHi()
		{
			$this->person->sayHi();
			echo "\tParent adds additional greetings\r\n";
		}
		
		public function doHomework()
		{
			$this->student->doHomework();
			echo "\tParent does homework\r\n";
		}
	}
	
	$p = new CParent();
	$p->sayHi();
	$p->doHomework();
?>