php interesting avatar puzzle_PHP tutorial

function pixelfuck($url, $chars='ewk34543§G§$§$Tg34g4g', $shrpns=1, $size=4,$weight=2)
{
    list($w, $h, $type) = getimagesize($url);
    $resource = imagecreatefromstring(file_get_contents($url));
    $img = imagecreatetruecolor($w*$size,$h*$size);

    $cc = strlen($chars);
    for($y=0;$y <$h;$y+=$shrpns) 
        for($x=0;$x <$w;$x+=$shrpns)
            imagestring($img,$weight,$x*$size,$y*$size, $chars{@++$p%$cc}, imagecolorat($resource, $x, $y));
    return $img;
}

$url = &#39;http://www.bkjia.com/uploads/allimg/140830/0421361239-0.png&#39;;
$text = &#39;I-dont-like-manga-...-Why-do-they-have-such-big-eyes? Strange-...-WHAT-WANT-YOU-DO?&#39;;

Header(&#39;Content-Type: image/png&#39;);
imagepng(pixelfuck($url, $text, 1, 6));