Echo variable first and assign variable values later in php

I am echoing the $indicator before $total using if else condition.

But I am getting php error

Notice: Undefined variable: indicator.

How I can achieve this without getting any error and get my result which will be yellow according to the if else condition. Is it possible?

<?php 

$total=6;
echo $indicator;
echo $total;

if($total<5) {
    $indicator="red";
} else if($total>7) {
    $indicator="green";
} else {
    $indicator="yellow";
}

?>