password hash to image

<?php
//convert password hash of (val) to image because why not

$img1 = @imagecreate(16,16);


if(isset($_GET["val"]))
$pf=$_GET["val"];
else $pf="lal";

$val=hash("haval256,3",$pf);

$z="0000000000";
$i=0;
$bin="";
while($i<64){
$n=base_convert(substr($val,$i,8),16,2);
if($L=8-strlen($n)) $n2=substr($z,0,$L).$n;
else $n2=$n;
$bin.=$n;
$i+=8;
}


//exit("ay: ".(strlen($bin)*1));

$green=imagecolorallocate($img1, 0, 255, 0);
$black=imagecolorallocate($img1, 0, 0, 0);

$i=0;

for($y = 0; $y < 16; ++$y){
    for($x = 0; $x < 16; ++$x){
        imagesetpixel($img1, $x, $y, ($bin[$i])*1);
        $i++; if(!isset($bin[$i])) $i=5;
    }
}


imagepng($img1, $val."_.png");


echo '<br><img width=128 height=128 src="'.$val.'_.png">';

?>