PHP Get Greeting

<?php
    function getGreeting(){
        $hour = date("H");
        if($hour >= 0 && $hour < 12){
            return "Good Morning";
        }else if($hour >= 12 && $hour < 18){
            return "Good Afternoon";
        }else if($hour >= 18 && $hour < 24){
            return "Good Evening";
        }
    }
?>