Untitled

<!DOCTYPE html>
<html>
<head>
 <meta charset="utf-8"/>
 <title> Série de Fibonacci </title>
    <style>
        body
        {
            background: rgba(74, 32, 172, 0.31);
            font: "Times new Roman", Verdana, Arial;
            text-decoration: none;
            text-shadow: 1px 1px 1px;
            color: #000000;
            text-align: center;
            font-weight: 200px;
            font: 22px;
        }
        a
        {
            text-decoration: none;
            color: #006699;
        }
    </style>
 </head>
 <body>
   <?php
   $posicao = $_GET['posicao'];
    $a = 0;
    $b = 1;
    $c = 1;
    $i = 1;
    while ($i <= $posicao )
    {
       $c =  $a + $b;
       $a = $b;
       $b = $c;
       echo($c. ",");
       $i++;
    }

   ?>
 </body>
 </html>