A PHP Class to adjust a hex value (basicly mixing with another color)

class-color-adjustments.php

<?php

namespace SayHello\nm;

/**
 * This Class provides some color adjustments
 *
 * @author Nico Martin <nico@sayhello.ch>
 */

class Color_Adjustments {

	public $color = [];

	public function __construct( $hex ) {
		$this->color = $this->hex2rgb( $hex );
	}

	/**
	 * @param string $hex
	 */
	public function hex2rgb( $hex = '#000000' ) {

		$f = function( $x ) {
			return hexdec( $x );
		};
		return array_map( $f, str_split( str_replace( '#', '', $hex ), 2 ) );
	}

	/**
	 * @param array $rgb
	 *
	 * @return string
	 */
	public function rgb2hex( $rgb = [ 0, 0, 0 ] ) {

		$f = function( $x ) {
			return str_pad( dechex( $x ), 2, '0', STR_PAD_LEFT );
		};
		return '#' . implode( '', array_map( $f, $rgb ) );
	}

	/**
	 * @return mixed
	 */
	public function get_hex () {
		return $this->rgb2hex( $this->color );
	}

	/**
	 * Color adjustments
	 */

	/**
	 * @param array $color_2
	 * @param float $weight
	 */
	public function mix( $color_2 = [ 0, 0, 0 ], $weight = 0.5 ) {
		
		if ( is_string( $color_2 ) ) {
			$color_2 = $this->hex2rgb( $color_2 );
		}

		$f = function( $x ) use ( $weight ) {
			return $weight * $x;
		};

		$g = function( $x ) use ( $weight ) {
			return (1 - $weight) * $x;
		};

		$h = function( $x, $y ) {
			return round( $x + $y );
		};

		$this->color = array_map( $h, array_map( $f, $this->color ), array_map( $g, $color_2 ) );
	}

	/**
	 * @param float $weight
	 */
	public function tint( $weight = 0.5 ) {

		$this->color = $this->mix( $this->color, [ 255, 255, 255 ], $weight );
	}

	/**
	 * @param float $weight
	 */
	public function tone( $weight = 0.5 ) {

		$this->color = $this->mix( $this->color, [ 128, 128, 128 ], $weight );
	}

	/**
	 * @param float $weight
	 */
	public function shade( $weight = 0.5 ) {

		$this->color = $this->mix( $this->color, [ 0, 0, 0 ], $weight );
	}
}

$color = new Color_Adjustments( '#ff0000' );
$color->mix( '#0000ff' );
echo $color->get_hex(); // #800080