Color Illusion

<?php

class Illusion
{
    protected $color = [];
    protected $changedColor = [];
    protected $name;

    public function color($color)
    {

        if (strlen($color) == 6 && ctype_xdigit($color)) {
            $this->color ['red'] = substr($color, 0, 2);
            $this->color ['green'] = substr($color, 2, 2);
            $this->color ['blue'] = substr($color, 4, 2);

            return $this;
        }

        return false;

    }



    public function nahid()
    {
        $change = ['red'=>100];
        $this->name = 'Nahid';

        return $this->brainProcess($change);
    }

    public function obi()
    {
        $change = ['green'=>100];
        $this->name = 'Obi';

        return $this->brainProcess($change);
    }

    public function naim()
    {
        $change = ['blue'=>100];
        $this->name = 'Naim';

        return $this->brainProcess($change);
    }

    public function see()
    {
        $originalColor = implode('', $this->color);
        $seenColor = implode('', $this->changedColor);

        $output = '<h3>' . $this->name. '</h3>';
        $output .= '<div style="width:100px; height:100px; background-color: #'. $originalColor .'; text-shadow: 1px 2px white;">Original</div>

<div style="width:100px; height:100px; background-color: #' .$seenColor .'; text-shadow: 1px 2px white;">Seen</div>';

    return $output;

    }


    protected function brainProcess($change)
    {
        $color = [];

        foreach($this->color as $key=>$val) {
            if (isset($change[$key])) {
                $processColor = hexdec($this->color[$key])+$change[$key];

                if ($processColor<=255) {
                    $this->changedColor[$key] = dechex($processColor);
                }else {
                    $this->changedColor[$key] = dechex(hexdec($this->color[$key])-$change[$key]);
                }

            }else {
                $this->changedColor[$key] = $this->color[$key];
            }


        }

        return $this;

    }


}

$illu = new Illusion;

$color = $illu->color('00ffff');

echo $color->nahid()->see();
echo $color->obi()->see();
echo $color->naim()->see();
?>