Color Mixing, Tint, Tone, and Shade in PHP

mix_tint_tone_shade.php

<?php

/**
 * mix
 *
 * @param  mixed $color_1
 * @param  mixed $color_2
 * @param  mixed $weight
 *
 * @return void
 */
function mix($color_1 = array(0, 0, 0), $color_2 = array(0, 0, 0), $weight = 0.5)
{
    $f = function ($x) use ($weight) {
        return $weight * $x;
    };

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

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

    return array_map($h, array_map($f, $color_1), array_map($g, $color_2));
}

/**
 * tint
 *
 * @param  mixed $color
 * @param  mixed $weight
 *
 * @return void
 */
function tint($color, $weight = 0.5)
{
    $t = $color;

    if (is_string($color)) {
        $t = hex2rgb($color);
    }

    $u = mix($t, array(255, 255, 255), $weight);

    if (is_string($color)) {
        return rgb2hex($u);
    }

    return $u;
}

/**
 * tone
 *
 * @param  mixed $color
 * @param  mixed $weight
 *
 * @return void
 */
function tone($color, $weight = 0.5)
{
    $t = $color;

    if (is_string($color)) {
        $t = hex2rgb($color);
    }

    $u = mix($t, array(128, 128, 128), $weight);

    if (is_string($color)) {
        return rgb2hex($u);
    }

    return $u;
}

/**
 * shade
 *
 * @param  mixed $color
 * @param  mixed $weight
 *
 * @return void
 */
function shade($color, $weight = 0.5)
{
    $t = $color;

    if (is_string($color)) {
        $t = hex2rgb($color);
    }

    $u = mix($t, array(0, 0, 0), $weight);

    if (is_string($color)) {
        return rgb2hex($u);
    }

    return $u;
}

/**
 * hex2rgb
 *
 * @param  mixed $hex
 *
 * @return void
 */
function hex2rgb($hex = '#000000')
{
    $f = function ($x) {
        return hexdec($x);
    };

    return array_map($f, str_split(str_replace("#", "", $hex), 2));
}

/**
 * rgb2hex
 *
 * @param  mixed $rgb
 *
 * @return void
 */
function rgb2hex($rgb = array(0, 0, 0))
{
    $f = function ($x) {
        return str_pad(dechex($x), 2, "0", STR_PAD_LEFT);
    };

    return "#" . implode("", array_map($f, $rgb));
}

usage.php

<?php

include __DIR__ . DIRECTORY_SEPARATOR . "mix_tint_tone_shade.php";

// base color
$base_color = "#67ff34";

print_r($base_color);
echo "\n";

// -----

// test hex2rgb
print_r(hex2rgb($base_color));
echo "\n";

// -----

// test rgb2hex
print_r(rgb2hex(hex2rgb($base_color)));
echo "\n";

// -----

// test tint (hex)
print_r(tint($base_color));
echo "\n";

// test tint (rgb)
print_r(tint(hex2rgb($base_color)));
echo "\n";

// -----

// test tone (hex)
print_r(tone($base_color));
echo "\n";

// test tone (rgb)
print_r(tone(hex2rgb($base_color)));
echo "\n";

// -----

// test shade (hex)
print_r(shade($base_color));
echo "\n";

// test shade (rgb)
print_r(shade(hex2rgb($base_color)));
echo "\n";

// -----

This was really handy for me in developing an automatic palette generator. I made a couple of modifications to your code, such as reversing the $f and $g anonymous functions of mix so that, for example if you're shading, the weight is the amount of shade (eg 0.2 is 20% shade), as well as condensing $t declarations and return lines in the shade, tone and tint functions into ternary operators. I made a fork in case you're interested. Thanks so much!

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