# chillerlan/php-settings-container

A container class for immutable settings objects. Not a DI container. PHP 7.4+
- [`SettingsContainerInterface`](https://github.com/chillerlan/php-settings-container/blob/main/src/SettingsContainerInterface.php) provides immutable properties with magic getter & setter and some fancy

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[php]: https://www.php.net/supported-versions.php
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[packagist]: https://packagist.org/packages/chillerlan/php-settings-container
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[gh-action]: https://github.com/chillerlan/php-settings-container/actions?query=workflow%3A%22CI%22

## Documentation

### Installation
**requires [composer](https://getcomposer.org)**

*composer.json* (note: replace `dev-main` with a [version constraint](https://getcomposer.org/doc/articles/versions.md#writing-version-constraints), e.g. `^2.1` - see [releases](https://github.com/chillerlan/php-settings-container/releases) for valid versions)
```json
{
	"require": {
		"php": "^7.4",
		"chillerlan/php-settings-container": "dev-main"
	}
}
```

Profit!

## Usage

The `SettingsContainerInterface` (wrapped in`SettingsContainerAbstract` ) provides plug-in functionality for immutable object properties and adds some fancy, like loading/saving JSON, arrays etc. 
It takes an `iterable` as the only constructor argument and calls a method with the trait's name on invocation (`MyTrait::MyTrait()`) for each used trait.

### Simple usage
```php
class MyContainer extends SettingsContainerAbstract{
	protected $foo;
	protected $bar;
}
```
Typed properties in PHP 7.4+:
```php
class MyContainer extends SettingsContainerAbstract{
	protected string $foo;
	protected string $bar;
}
```

```php
// use it just like a \stdClass
$container = new MyContainer;
$container->foo = 'what';
$container->bar = 'foo';

// which is equivalent to 
$container = new MyContainer(['bar' => 'foo', 'foo' => 'what']);
// ...or try
$container->fromJSON('{"foo": "what", "bar": "foo"}');


// fetch all properties as array
$container->toArray(); // -> ['foo' => 'what', 'bar' => 'foo']
// or JSON
$container->toJSON(); // -> {"foo": "what", "bar": "foo"}
// JSON via JsonSerializable
$json = json_encode($container); // -> {"foo": "what", "bar": "foo"}

//non-existing properties will be ignored:
$container->nope = 'what';

var_dump($container->nope); // -> null
```

### Advanced usage
```php
trait SomeOptions{
	protected $foo;
	protected $what;
	
	// this method will be called in SettingsContainerAbstract::construct()
	// after the properties have been set
	protected function SomeOptions(){
		// just some constructor stuff...
		$this->foo = strtoupper($this->foo);
	}
	
	// this method will be called from __set() when property $what is set
	protected function set_what(string $value){
		$this->what = md5($value);
	}
}

trait MoreOptions{
	protected $bar = 'whatever'; // provide default values
}
```

```php
$commonOptions = [
	// SomeOptions
	'foo' => 'whatever', 
	// MoreOptions
	'bar' => 'nothing',
];

// now plug the several library options together to a single object 
$container = new class ($commonOptions) extends SettingsContainerAbstract{
	use SomeOptions, MoreOptions;
};

var_dump($container->foo); // -> WHATEVER (constructor ran strtoupper on the value)
var_dump($container->bar); // -> nothing

$container->what = 'some value';
var_dump($container->what); // -> md5 hash of "some value"
```

### API

#### [`SettingsContainerAbstract`](https://github.com/chillerlan/php-settings-container/blob/main/src/SettingsContainerAbstract.php)

method | return  | info
-------- | ----  | -----------
`__construct(iterable $properties = null)` | - | calls `construct()` internally after the properties have been set
(protected) `construct()` | void | calls a method with trait name as replacement constructor for each used trait
`__get(string $property)` | mixed | calls `$this->{'get_'.$property}()` if such a method exists
`__set(string $property, $value)` | void | calls `$this->{'set_'.$property}($value)` if such a method exists
`__isset(string $property)` | bool | 
`__unset(string $property)` | void | 
`__toString()` | string | a JSON string
`toArray()` | array | 
`fromIterable(iterable $properties)` | `SettingsContainerInterface` | 
`toJSON(int $jsonOptions = null)` | string | accepts [JSON options constants](http://php.net/manual/json.constants.php)
`fromJSON(string $json)` | `SettingsContainerInterface` | 
`jsonSerialize()` | mixed | implements the [`JsonSerializable`](https://www.php.net/manual/en/jsonserializable.jsonserialize.php) interface

## Disclaimer
This might be either an utterly genius or completely stupid idea - you decide. However, i like it and it works.
Also, this is not a dependency injection container. Stop using DI containers FFS.
