src/Sparkline/StyleTrait.php
protected function colorHexToRGB($color)
    {
        if (!$this->checkColorHex($color)) {
            throw new \InvalidArgumentException('Invalid hexadecimal value ' . $color);
        }

        $color = mb_strtolower($color);
        $color = ltrim($color, '#');
        if (mb_strlen($color) === static::HEXADECIMAL_ALIAS_LENGTH) {
            $color = $color[0] . $color[0] . $color[1] . $color[1] . $color[2] . $color[2];
        }
        $color = hexdec($color);

        return [
            0xFF & ($color >> 0x10), // Red
            0xFF & ($color >> 0x8), // Green
            0xFF & $color, // Blue
        ];
    }
protected function colorHexToRGB($color)
    {
        if (!$this->checkColorHex($color)) {
            throw new \InvalidArgumentException('Invalid hexadecimal value ' . $color);
        }

        $color = mb_strtolower($color);
        $color = ltrim($color, '#');
        if (mb_strlen($color) === static::HEXADECIMAL_ALIAS_LENGTH) {
            $color = $color[0] . $color[0] . $color[1] . $color[1] . $color[2] . $color[2];
        }
        $color = hexdec($color);

        return [
            0xFF & ($color >> 0x10), // Red
            0xFF & ($color >> 0x8), // Green
            0xFF & $color, // Blue
        ];
    }
@param string $color (hexadecimal)
@exceptions \InvalidArgumentException

@return array (r,g,b)