Colors

Following Color class will allow you to convert colors from RGB to hex and back

class Color
{
  /** int $red */
  public $red;

  /** int $green */
  public $green;

  /** int $blue */
  public $blue;

  /**
   * Color constructor.
   * @param $red
   * @param $green
   * @param $blue
   */
  public function __construct($red, $green, $blue)
  {
      $this->red = $red;
      $this->green = $green;
      $this->blue = $blue;
  }

  // ...
}

Convert from HEX string to RGB add this function to our class

public static function convertToRGB($hex)
{
    $hex = ltrim($hex, "#");

    if (!ctype_xdigit($hex))
        throw new NotHexException();

    $red = hexdec(substr($hex, 0, 2));
    $green = hexdec(substr($hex, 2, 2));
    $blue = hexdec(substr($hex, 4, 2));

    return new Color($red, $green, $blue);
}

This is how you can convert from rgb back to HEX string.

public static function convertToHex(Color $color)
{
    $red = dechex($color->red);
    if (strlen($red) < 2) $red = '0' . $red;

    $green = dechex($color->green);
    if (strlen($green) < 2) $green = '0' . $green;

    $blue = dechex($color->blue);
    if (strlen($blue) < 2) $blue = '0' . $blue;

    return '#' . $red . $green . $blue;
}

One thing is missing and it’s exception which is used in convertToRGB function:

class NotHexException extends \Exception
{
  public function __construct($message = "String you have provided is not HEX", $code = 0, Throwable $previous = null)
  {
      parent::__construct($message, $code, $previous);
  }
}

To use it

use MayMeow\PHPColor\Color;
// ...
$color = new Color(198, 255, 32);
$hex = Color::convertToHex($color); //#c6ff20

and back to RGB

use MayMeow\PHPColor\Color;
// ...
try {
    $rgb = Color::convertToRGB($hex); // color object: Color(198, 255, 32)
} catch (\MayMeow\PHPColor\Exceptions\NotHexException $exception)
{
    // do something, echo message or log ...
}

Photo by Sharon McCutcheon on Unsplash