theiconic/config

General purpose config manager for file-based configuration.

Setup

composer require theiconic/config

Concepts

Spaces

Configuration is grouped into configuration spaces. Spaces are managed by the configuration factory.

Multi-file & multi-section configuration

A configuration space can read configuration from several files. The configuration is merged and then flattened by section.

Placeholders

During parsing, pre-defined placeholders will be replaced with the configured replacement values.

Example

So the basic setup looks something like this (modified example based on alice):

// get the factory instance
$factory = Factory::getInstance();

// set the current environment
$factory->setEnvironment(APPLICATION_ENV);

// configure cache path
$factory->setCachePath(sprintf('%s/config', APPLICATION_TMP));

// instanciate and configure the application config space
$factory->getSpace('application')
    ->setPaths([
        '/etc/iconic.ini',
        $basePath . 'application.ini',
        $basePath . 'application.local.ini',
    ])
    ->setSections([
        'default',
        'production',
    ])
    ->setPlaceholders([
        '%APPLICATION_ENV%' => APPLICATION_ENV,
        '%APPLICATION_ROOT%' => APPLICATION_ROOT,
        '%APPLICATION_TMP%' => APPLICATION_TMP,
    ]);

Multi-section config format

Configuration files must contain configuration sections. This is the sections in .ini files and the first level array/object items in .php or .json config files.

No sections are pre-selected by default. You will need to explicitly state the sections in code, like so:

$factory->getSpace('myConfig')
    ->setSections(['main', 'development', 'testing']);

Sections will be merged in the order specified, i.e. entries in later sections will override those in earlier sections.

Caching

All configuration is parsed into multidimensional PHP arrays. The arrays are then stored in cache files so that expensive parsing is bypassed.

Cache keys are determined based on

• the list of source files names
• the list on section names.

Cache is automatically validated based on file modification timestamps. Hence, the cache will automatically update itself whenever any of the source configuration files changes.

Parsing

Extendable parsers are used to parse different file formats. Currently implemented parsers are:

• Ini (for .ini files)
• Json (for .json files)
• Php (for .php files)
• Autodetect (automatically picks the right parser based on extension)
• Dummy (for unit tests etc.)

Accessing configuration values

Configuration can be accessed via dot-paths. These paths are dynamically resolved against the internal array-representation of configuration. This allows retrieving individual entries as well as collections of entries.

Factory::getInstance()->getSpace('application')->get('redis.retries', 3);
Factory::getInstance()->getSpace('application')->get('redis.hosts', 'localhost');
 
Factory::getInstance()->getSpace('application')->get('redis', ['retries': 3, 'hosts': 'localhost]);

You can also retrieve the configuration as a flat array of dot-path to value mappings:

Factory::getInstance()->getSpace('application')->flatten();

Using environment variables

There is no explicit functionality to handle environment variables, however they can be dynamically used in the configurations via the placeholders mechanism:

$space = Factory::getInstance()->getSpace('application');
foreach ($_ENV as $key => $value) {
    $placeholder = sprintf('%%ENV_%s%%', strtoupper(str_replace('%', '_', $key)));
    $space->addPlaceholder($placeholder, $value);
}

With these few lines in place, a configuration file could look like this:

[main]
user.name = %ENV_USER%
user.home = %ENV_HOME%

License

THE ICONIC config library for PHP is released under the MIT License.