<?php
    $count = 0 ;
    $f1 = 0;
    $f2 = 1;

    echo $f1." , ";
    echo $f2." , ";

    while ($count < 5 ){
        $f3 = $f2 + $f1 ;
        echo $f3." , ";
        $f1 = $f2 ;
        $f2 = $f3 ;
        $count = $count + 1;
    }
?>