PHP Color

Color parsing, conversion, manipulation, and WCAG contrast checking.

Requirements

• PHP 8.2+

Installation

composer require philiprehberger/php-color

Usage

Creating Colors

use PhilipRehberger\Color\Color;

$color = Color::hex('#ff6347');       // From hex
$color = Color::rgb(255, 99, 71);    // From RGB
$color = Color::hsl(9, 100, 64);     // From HSL
$color = Color::named('tomato');      // From CSS name
$color = Color::random();            // Random color

Converting Colors

$color = Color::hex('#ff6347');

$color->toHex();    // '#ff6347'
$color->toRgb();    // 'rgb(255, 99, 71)'
$color->toHsl();    // 'hsl(9, 100%, 63.9%)'
$color->toArray();  // ['r' => 255, 'g' => 99, 'b' => 71, 'alpha' => 1.0]

Manipulating Colors

All manipulation methods return new Color instances (immutable).

$color = Color::hex('#3366cc');

$color->lighten(20);        // Lighten by 20%
$color->darken(10);         // Darken by 10%
$color->saturate(15);       // Increase saturation by 15%
$color->desaturate(15);     // Decrease saturation by 15%
$color->invert();           // Invert the color
$color->grayscale();        // Convert to grayscale

$red = Color::hex('#ff0000');
$blue = Color::hex('#0000ff');
$red->mix($blue, 0.5);     // Mix two colors

Blending Colors

$red = Color::hex('#ff0000');
$blue = Color::hex('#0000ff');

$red->blend($blue, 'multiply');   // Multiply blend
$red->blend($blue, 'screen');     // Screen blend
$red->blend($blue, 'overlay');    // Overlay blend
$red->blend($blue, 'darken');     // Darken blend
$red->blend($blue, 'lighten');    // Lighten blend

Color Analysis

$color = Color::hex('#3366cc');

$color->isLight();  // false
$color->isDark();   // true

$red = Color::hex('#ff0000');
$blue = Color::hex('#0000ff');
$red->distance($blue);  // CIE76 Delta E perceptual distance

WCAG Contrast Checking

$text = Color::hex('#333333');
$bg = Color::hex('#ffffff');

$text->contrastRatio($bg);    // 12.63
$text->meetsWcagAA($bg);      // true (>= 4.5:1)
$text->meetsWcagAAA($bg);     // true (>= 7:1)

// Also accepts hex strings directly
$text->contrastRatio('#ffffff');

Generating Palettes

use PhilipRehberger\Color\Palette;

$color = Color::hex('#ff6347');

Palette::complementary($color);        // [original, complement]
Palette::analogous($color);            // [left, original, right]
Palette::triadic($color);              // [original, +120deg, +240deg]
Palette::splitComplementary($color);   // [original, +150deg, +210deg]
Palette::tetradic($color);             // [original, +90deg, +180deg, +270deg]
Palette::shades($color, 5);            // 5 progressively darker shades
Palette::tints($color, 5);             // 5 progressively lighter tints

Generating Gradients

$black = Color::hex('#000000');
$white = Color::hex('#ffffff');

Palette::gradient($black, $white, 5);          // 5-step RGB gradient
Palette::gradient($black, $white, 5, 'hsl');   // 5-step HSL gradient

API

Color

Method	Description
Color::hex(string $hex): Color	Create from hex string (3, 4, 6, or 8 digits)
Color::rgb(int $r, int $g, int $b, float $alpha = 1.0): Color	Create from RGB values
Color::hsl(float $h, float $s, float $l, float $alpha = 1.0): Color	Create from HSL values
Color::named(string $name): Color	Create from CSS named color
Color::random(): Color	Generate a random color
->lighten(float $percent): Color	Lighten by percentage
->darken(float $percent): Color	Darken by percentage
->saturate(float $percent): Color	Increase saturation
->desaturate(float $percent): Color	Decrease saturation
->mix(Color $other, float $weight = 0.5): Color	Mix with another color
->blend(Color $other, string $mode): Color	Blend with another color using a CSS blend mode
->invert(): Color	Invert the color
->grayscale(): Color	Convert to grayscale
->distance(Color $other): float	CIE76 Delta E perceptual distance
->isLight(): bool	True if relative luminance > 0.5
->isDark(): bool	True if relative luminance <= 0.5
->contrastRatio(Color|string $other): float	WCAG contrast ratio (1.0-21.0)
->meetsWcagAA(Color|string $background): bool	Meets WCAG AA (4.5:1)
->meetsWcagAAA(Color|string $background): bool	Meets WCAG AAA (7:1)
->toHex(): string	Output as hex string
->toRgb(): string	Output as rgb()/rgba() string
->toHsl(): string	Output as hsl()/hsla() string
->toArray(): array	Output as associative array

Palette

Method	Description
Palette::complementary(Color $color): array	Complementary pair
Palette::analogous(Color $color, float $angle = 30.0): array	Three analogous colors
Palette::triadic(Color $color): array	Three triadic colors
Palette::splitComplementary(Color $color): array	Split-complementary triad
Palette::tetradic(Color $color): array	Tetradic (rectangular) quartet
Palette::gradient(Color $start, Color $end, int $steps, string $space = 'rgb'): array	Interpolated color gradient
Palette::shades(Color $color, int $count = 5): array	Progressive darker shades
Palette::tints(Color $color, int $count = 5): array	Progressive lighter tints

Development

composer install
vendor/bin/phpunit
vendor/bin/pint --test

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License

MIT