(PHP) Imagem Facebook!

<?php

    //_____________________________________________________

    $usuario = $_GET['user'];
    $imagem = Redirect("http://graph.facebook.com/$usuario/picture");

    $dados = file_get_contents( $imagem );

    file_put_contents("imagem.jpg", $dados);


    //_____________________________________________________

    list($width, $height) = getimagesize("imagem.jpg");

    //________________________________________________

    $img = imagecreatefromjpeg("imagem.jpg");

    for($w = 0; $w < $width; $w ++ ) {
        for($h = 0; $h < $height; $h ++ ) {

            $dd = imagecolorat($img, $w, $h);

            $r = ($dd >> 16) & 0xFF;
            $g = ($dd >> 8) & 0xFF;
            $b = $dd & 0xFF;

            echo   RGBToHex($r,$g,$b) . "|$w|$h|";

        }
    }


    //_____________________________________________________


    function RGBToHex($r, $g, $b) {

        $hex = str_pad(dechex($r), 2, "0", STR_PAD_LEFT);
        $hex.= str_pad(dechex($g), 2, "0", STR_PAD_LEFT);
        $hex.= str_pad(dechex($b), 2, "0", STR_PAD_LEFT);

        return hexdec($hex."FF");
    }


    //_____________________________________________________

    // Thanks to: http://stackoverflow.com/questions/3519939/make-curl-follow-redirects
    function Redirect($url) {
        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_HEADER, true);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

        $a = curl_exec($ch);
        curl_close( $ch );

        $headers = explode("\n",$a);
        $redir = $url;

        $j = count($headers);
        for($i = 0; $i < $j; $i++){

        if(strpos($headers[$i],"Location:") !== false){
                $redir = trim(str_replace("Location:","",$headers[$i]));
                break;
            }
        }
        return $redir;
    }

    //_____________________________________________________

    unlink("imagem.jpg");
?>