fibonnaci eclipse

fbn_ecl.php

<?php
$count = 10;
function f(int $n)
{
    $nPrev = 1;
    $nCurrent = 1;

    for ($x = 0; $x < $n - 1; $x++) {
        $nNext = $nPrev + $nCurrent;
        $nPrev = $nCurrent;
        $nCurrent = $nNext;
        yield $nCurrent;
    }
}


$x = 300;
$y = 350;
$image = imagecreatetruecolor($x, $y); // horizontal, vertical
$white = imagecolorallocatealpha($image, 255, 255, 255, 75);
$yellow = imagecolorallocatealpha($image, 255, 255, 0, 75);

foreach (f($count) as $fbn) {
    imageellipse($image, (70 + $fbn), (100 + $fbn), (100 + $fbn), (150 + $fbn), $yellow);
}

header('Content-type: image/png');
ImagePNG($image);
ImageDestroy($image);