random avatar

$gd = imagecreate(120, 120);
        $code = str_baseconvert(md5("image_shape_salt_" + $id), 16, 8);
        $color = str_baseconvert(md5("image_color_salt_" + $id), 16, 36);
        $background = imagecolorallocatealpha($gd, 255, 255, 255, 0);
        $maincolor = imagecolorallocate($gd, base_convert($color[0], 36, 10) * 10 + 100, base_convert($color[1], 36, 10) * 10 + 100, base_convert($color[2], 36, 10) * 10 + 100);
        for ($x = 0; $x < 4; $x++) {
            for ($z = 0; $z < 4; $z++) {
                $number = (int) $code[$x * 4 + $z];
                switch ($number) {
                    case 0:
                        break;
                    case 1: // Full square
                        imagefilledrectangle($gd, $x * 30, $z * 30, $x * 30 + 29, $z * 30 + 29, $maincolor);
                        break;
                    case 2: // top
                        imagefilledrectangle($gd, $x * 30, $z * 30, $x * 30 + 14, $z * 30 + 29, $maincolor);
                        break;
                    case 3: // left
                        imagefilledrectangle($gd, $x * 30, $z * 30, $x * 30 + 29, $z * 30 + 14, $maincolor);
                        break;
                    case 4: // bottom
                        imagefilledrectangle($gd, $x * 30 + 15, $z * 30, $x * 30 + 29, $z * 30 + 29, $maincolor);
                        break;
                    case 5: // right
                        imagefilledrectangle($gd, $x * 30, $z * 30 + 15, $x * 30 + 29, $z * 30 + 29, $maincolor);
                        break;
                    case 6: // middle
                        imagefilledrectangle($gd, $x * 30 + 5, $z * 30 + 5, $x * 30 + 24, $z * 30 + 24, $maincolor);
                        break;
                    case 7: // hollow
                        imagefilledrectangle($gd, $x * 30, $z * 30, $x * 30 + 29, $z * 30 + 29, $maincolor);
                        imagefilledrectangle($gd, $x * 30 + 7, $z * 30 + 7, $x * 30 + 22, $z * 30 + 22, $background);
                        break;
                }
            }
        }
        $pattern = imagecreate(60, 60);
        imagecopyresized($pattern, $gd, 0, 0, 0, 0, 60, 60, 120, 120);
        imagecopy($gd, $pattern, 0, 0, 0, 0, 60, 60);
        imageflip($pattern, IMG_FLIP_HORIZONTAL);
        imagecopy($gd, $pattern, 60, 0, 0, 0, 60, 60);
        imageflip($pattern, IMG_FLIP_VERTICAL);
        imagecopy($gd, $pattern, 60, 60, 0, 0, 60, 60);
        imageflip($pattern, IMG_FLIP_HORIZONTAL);
        imagecopy($gd, $pattern, 0, 60, 0, 0, 60, 60);
        imagedestroy($pattern);
        imagepng($gd);
        imagedestroy($gd);