Need-Soft - Graph PHP (code)

<?php
if (isset($_GET['height']))
$height = $_GET['height'];
else
$height = 45;
if (isset($_GET['color1']))
$color1 = $_GET['color1'];
else
$color1 = "209F0B";
if (isset($_GET['color2']))
$color2 = $_GET['color2'];
else
$color2 = "60D154";
if (isset($_GET['color3']))
$color3 = $_GET['color3'];
else
$color3 = "404040";
if (isset($_GET["value"]))
{
$value = $_GET["value"];
$addval=0;
$valuearray = explode(",", $value);
$width = count($valuearray);
$addval=max($valuearray);
$moyadd=floor($addval/$height);
for($i=0;$i<($width+1);$i++)
{
$newvalue=floor($valuearray[$i]/$moyadd);
$value2[$i] = $height-$newvalue;
}
}
$values[0] = 0;
$values[1] = $height;
for($i=0;$i<($width+1);$i++)
{
$values[$i*2+2] = $i;
$values[$i*2+3] = $value2[$i];
}
$values[(($width*2)+2)] = (($width*2)+1);
$values[(($width*2)+3)] = $height+1;
//);
$image = imagecreatetruecolor(($width+2), $height+1);
$rouge1 = hexdec(substr($color1,0,2));
$vert1 = hexdec(substr($color1,2,2));
$bleu1 = hexdec(substr($color1,4,2));
$rouge2 = hexdec(substr($color2,0,2));
$vert2 = hexdec(substr($color2,2,2));
$bleu2 = hexdec(substr($color2,4,2));
$rouge3 = hexdec(substr($color3,0,2));
$vert3 = hexdec(substr($color3,2,2));
$bleu3 = hexdec(substr($color3,4,2));
$line = imagecolorallocate($image, $rouge1, $vert1, $bleu1);
$bg = imagecolorallocate($image, $rouge2, $vert2, $bleu2);
$borderl = imagecolorallocate($image, $rouge3, $vert3, $bleu3);
imagefilledpolygon($image, $values, ($width+2), $bg);
imagepolygon($image, $values, ($width+2), $line);
imagerectangle($image, 0, 0, $width+1, $height, $borderl);
header('Content-type: image/png');
imagecolortransparent($image,0);
imagepng($image);
imagedestroy($image);
?>

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