php - Graphic design program not working -

i read graphic design extensions in php , trying create square different colors. example.

here program:

<?php $color = array(0 => array('35', '3b', '1a'),                1 => array('7e', 'a6', '29'),                2 => array('d9', 'c9', '9a'),                3 => array('d9', '30', '30'),                4 => array('73', '07', '10'),                5 => array('d9', '62', 'c6')                ); $image = imagecreate(200,200); $maxsize = 200; $currentcolor = 0; $yellow = imagecolorallocate($image, 0xff, 0xff, 0x00); for($i = 0; $i <= 200; $i += 10) {     if($currentcolor == 6) {         $currentcolor = 0;     }     $red = "0x".$color[$currentcolor][0];     $green = "0x".$color[$currentcolor][1];     $blue = "0x".$color[$currentcolor][2];     $red = (int)$red;     $green = (int)$green;     $blue = (int)$blue;     $rescolor = imagecolorallocate($image, $red, $green, $blue);     imagefilledrectangle($image, $i, $i, $maxsize -= 10, $maxsize -= 10, $rescolor);     $currentcolor++; } header("content-type: image/png"); imagepng($image); ?> 

however, code produces black square. how can make square multicolored?

these 2 arguments not want:

imagefilledrectangle($image, $i, $i, $maxsize -= 10, $maxsize -= 10, $rescolor);'                                      ^^^^^^^^^^^^^^  ^^^^^^^^^^^^^^ 

this code functioning as:

$maxsize = $maxsize - 10; $foo = $maxsize; $maxsize = $maxsize - 10; $bar = $maxsize; imagefilledrectangle($image, $i, $i, $foo, $bar, $rescolor);