Yellow
A pastel lime with the freshness of a spring lime.
Create Yellow in PHP
Parse the catalog’s canonical value once, then keep the resulting color object throughout the rest of your code.
<?php
use PhpColor\Color\Color;
$yellow = Color::parse('#FFFF00');ColorInterface
$yellow
#ffff00 · oklch(0.9680 0.2110 109.8)
Build a Yellow harmony
tetradic() keeps Yellow and adds three partners at equal quarter-turns around the OKLCH hue wheel.
<?php
$harmony = $yellow->tetradic();
foreach ($harmony as $color) {
echo $color->toHex().PHP_EOL;
}- 0
#ffff00 - 1
#00ffff - 2
#f4d8ff - 3
#ffb3b9
Generate a Yellow scale
Keep the original hue and chroma, then vary OKLCH lightness to produce perceptually ordered steps.
<?php
$oklch = $yellow->to('oklch');
foreach ([0.97, 0.92, 0.84, 0.74, 0.66, 0.58, 0.48, 0.40, 0.32, 0.24, 0.16] as $lightness) {
$step = $oklch->withChannel('l', $lightness);
}50
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Format Yellow for the web
The same object can emit a compact Hex value, an sRGB CSS function, or its perceptual OKLCH coordinates.
<?php
$hex = $yellow->toHex();
$rgb = $yellow->toCss('srgb');
$oklch = $yellow->to('oklch')->toCss();- hex
#ffff00- rgb
rgb(255 255 0)- oklch
oklch(0.967983 0.211006 109.769)