Php Program to generate Fibonacci series?

The Php Program to generate the Fibonacci series is :

<?php

function Fibonacci($n){

    $num1 = 0;

    $num2 = 1;

    $counter = 0;

    while ($counter < $n){

        echo ' '.$num1;

        $num3 = $num2 + $num1;

        $num1 = $num2;

        $num2 = $num3;

        $counter = $counter + 1;

    }

}

$n = 10;

Fibonacci($n);

?>