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Informations about the package php-color
A small, framework-agnostic PHP library for color conversion, luminance, contrast and deterministic string-to-color hashing. No runtime dependencies.
🚀 Features
- Immutable
Colorvalue object withRgbandHslcompanions - Lossless conversion between hex, RGB and HSL
- Multi-format string parsing via
fromString()/tryFromString() - CSS
rgb()/rgba()output with optional alpha channel - WCAG 2.x relative luminance and contrast ratio
optimalTextColor()— pick readable text color for any background- Deterministic string → color hashing (SHA-256/HSL or CRC32)
🔥 Installation
⚡ Usage
Conversion
scaleRgb() multiplies every RGB channel by the factor (clamped to 0–255),
while withLightness() works in HSL space — use scaleRgb() for plain
per-channel brightness math. darken() is an alias. Factors below 0.0 throw
InvalidColorValue:
Short hex (#abc), missing # and surrounding whitespace are all accepted.
Invalid values throw KonradMichalik\Color\Exception\InvalidColorValue.
Parsing arbitrary strings
fromString() accepts hex, rgb(r, g, b) and hsl(h, s%, l%) in one call —
whitespace is ignored, prefixes are case-insensitive and the HSL percent signs
are optional:
Use tryFromString() for fallbacks — it returns null instead of throwing:
CSS output with alpha
The model stays RGB-only; alpha is an output concern. Values outside 0.0–1.0
throw KonradMichalik\Color\Exception\InvalidColorValue.
Contrast & readable text
optimalTextColor() returns whichever candidate (black/white by default, or two
custom colors) has the higher contrast against the background.
Deterministic colors from strings
Great for avatar backgrounds or tag colors — the same input always yields the same color:
Need a custom mapping? Implement KonradMichalik\Color\Hashing\HashStrategy and
pass it to new ColorHasher($strategy).
🧑💻 Contributing
Please have a look at CONTRIBUTING.md.
📄 License
This project is licensed under GPL-2.0-or-later.
