A greeting Class

greeter.php

<?php
class Greeter {
	private $greeting;
	
	public function __construct() {
		$this->greeting = 'Hello';
	}
	
	public function greet( $subject = '' ) {
		return $this->greeting . ' ' . $subject . '!' . PHP_EOL;
	}
}

$g = new Greeter();
echo $g->greet( 'World' );