public static function colorToHex($color)
    {
        $colors = array(
            'maroon'    => '800000',
            'red'       => 'FF0000',
            'orange'    => 'FFA500',
            'yellow'    => 'FFFF00',
            'olive'     => '808000',
            'purple'    => '800080',
            'fuchsia'   => 'FF00FF',
            'white'     => 'FFFFFF',
            'lime'      => '00FF00',
            'green'     => '008000',
            'navy'      => '000080',
            'blue'      => '0000FF',
            'aqua'      => '00FFFF',
            'teal'      => '008080',
            'black'     => '000000',
            'silver'    => 'C0C0C0',
            'gray'      => '808080',
        );
        if (array_key_exists($color, $colors)) {
            return $colors[$color];
        }
        
        $color_pattern = '/rgb\((.*?)\)/';
        preg_match($color_pattern, $color, $matches);
        if (is_array($matches) && count($matches) > 0) {
            $rgb = explode(',', $matches[1]);
            if (is_array($rgb) && count($rgb) === 3) {
                return self::RGBToHex($rgb[0], $rgb[1], $rgb[2]);
            }
        }
        
        return $color;
    }