Define configuration arrays with strict schemas and access values with dot notation

v1.2.0 2022-12-11 20:36 UTC

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Last update: 2024-07-14 00:15:52 UTC


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league/config helps you define nested configuration arrays with strict schemas and access configuration values with dot notation. It was created by Colin O'Dell.

📦 Installation

This project requires PHP 7.4 or higher. To install it via Composer simply run:

composer require league/config

🧰️ Basic Usage

The Configuration class provides everything you need to define the configuration structure and fetch values:

use League\Config\Configuration;
use Nette\Schema\Expect;

// Define your configuration schema
$config = new Configuration([
    'database' => Expect::structure([
        'driver' => Expect::anyOf('mysql', 'postgresql', 'sqlite')->required(),
        'host' => Expect::string()->default('localhost'),
        'port' => Expect::int()->min(1)->max(65535),
        'ssl' => Expect::bool(),
        'database' => Expect::string()->required(),
        'username' => Expect::string()->required(),
        'password' => Expect::string()->nullable(),
    'logging' => Expect::structure([
        'enabled' => Expect::bool()->default($_ENV['DEBUG'] == true),
        'file' => Expect::string()->deprecated("use logging.path instead"),
        'path' => Expect::string()->assert(function ($path) { return \is_writeable($path); })->required(),

// Set the values, either all at once with `merge()`:
    'database' => [
        'driver' => 'mysql',
        'port' => 3306,
        'database' => 'mydb',
        'username' => 'user',
        'password' => 'secret',

// Or one-at-a-time with `set()`:
$config->set('logging.path', '/var/log/myapp.log');

// You can now retrieve those values with `get()`.
// Validation and defaults will be applied for you automatically
$config->get('database');        // Fetches the entire "database" section as an array
$config->get('database.driver'); // Fetch a specific nested value with dot notation
$config->get('database/driver'); // Fetch a specific nested value with slash notation
$config->get('database.host');   // Returns the default value "localhost"
$config->get('logging.path');    // Guaranteed to be writeable thanks to the assertion in the schema

// If validation fails an `InvalidConfigurationException` will be thrown:
$config->set('database.driver', 'mongodb');
$config->get('database.driver'); // InvalidConfigurationException

// Attempting to fetch a non-existent key will result in an `InvalidConfigurationException`

// You could avoid this by checking whether that item exists:
$config->exists('foo.bar'); // Returns `false`

📓 Documentation

Full documentation can be found at config.thephpleague.com.

💭 Philosophy

This library aims to provide a simple yet opinionated approach to configuration with the following goals:

  • The configuration should operate on arrays with nested values which are easily accessible
  • The configuration structure should be defined with strict schemas defining the overall structure, allowed types, and allowed values
  • Schemas should be defined using a simple, fluent interface
  • You should be able to add and combine schemas but never modify existing ones
  • Both the configuration values and the schema should be defined and managed with PHP code
  • Schemas should be immutable; they should never change once they are set
  • Configuration values should never define or influence the schemas

As a result, this library will likely never support features like:

  • Loading and/or exporting configuration values or schemas using YAML, XML, or other files
  • Parsing configuration values from a command line or other user interface
  • Dynamically changing the schema, allowed values, or default values based on other configuration values

If you need that functionality you should check out other libraries like:

🏷️ Versioning

SemVer is followed closely. Minor and patch releases should not introduce breaking changes to the codebase.

Any classes or methods marked @internal are not intended for use outside this library and are subject to breaking changes at any time, so please avoid using them.

🛠️ Maintenance & Support

When a new minor version (e.g. 1.0 -> 1.1) is released, the previous one (1.0) will continue to receive security and critical bug fixes for at least 3 months.

When a new major version is released (e.g. 1.1 -> 2.0), the previous one (1.1) will receive critical bug fixes for at least 3 months and security updates for 6 months after that new release comes out.

(This policy may change in the future and exceptions may be made on a case-by-case basis.)

👷‍️ Contributing

Contributions to this library are welcome! We only ask that you adhere to our contributor guidelines and avoid making changes that conflict with our Philosophy above.

🧪 Testing

composer test

📄 License

league/config is licensed under the BSD-3 license. See the LICENSE.md file for more details.

🗺️ Who Uses It?

This project is used by league/commonmark.