<?php
class Person {
	public $name;
	public $age;
	public function __construct($name, $age) {
		$this -> name = $name;
		$this -> age = $age;
	}
	public function introduce() {
		echo "My name is {$this -> name}. My age is {$this -> age}";
	}
}
/* Tom is inherited from Person */
class Tom extends Person {
	# __construct() is inherited
	# introduce() is inherited
	public function sayHello() {
		echo "Hello, World <br>";
	}
}
$tom = new Tom('Tom', 29);
$tom -> sayHello();
$tom -> introduce();