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Informations about the package definitions

Yii

Yii Definitions


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The package provides syntax constructs describing a way to create and configure a service or an object. It is used by yiisoft/di and yiisoft/factory but could be used in other PSR-11 compatible packages as well.

The following are provided:

Requirements

Installation

The package could be installed with Composer:

General usage

Definitions

Definition is describing a way to create and configure a service, an object or return any other value. It must implement Yiisoft\Definitions\Contract\DefinitionInterface that has a single method resolve(ContainerInterface $container). References are typically stored in the container or a factory and are resolved into object at the moment of obtaining a service instance or creating an object.

ArrayDefinition

Array definition allows describing a service or an object declaratively:

In the above:

For multiple method call postfix key with unique string, for example:

CallableDefinition

Callable definition builds an object by executing a callable injecting dependencies based on types used in its signature:

In the above we use a closure, a static call and a static method passed as array-callable. In each case we determine and pass dependencies based on the types of arguments in the callable signature.

ParameterDefinition

Parameter definition resolves an object based on information from ReflectionParameter instance:

It is mostly used internally when working with callables.

ValueDefinition

Value definition resolves value passed as is:

References

References point to other definitions so when defining a definition you can use other definitions as its dependencies:

Optional reference returns null when there's no corresponding definition in container:

The DynamicReference defines a dependency to a service not defined in the container:

In order to pass an array of IDs as references to a property or an argument, Yiisoft\Definitions\ReferencesArray or Yiisoft\Definitions\DynamicReferencesArray could be used:

Definition storage

Definition storage could be used to hold and obtain definitions and check if a certain definition could be instantiated. Usually it is used by an implementation using the definitions:

In the above $buildStack will contain a stack with definition IDs in the order the latest dependency obtained would be built.

By default, if a class is checked in has() and it is not explicitly defined, the storage tries to autoload it first before failing. The storage may also work in a strict mode when everything in it should be defined explicitly:

has() will return false even if EngineMarkOne exists.

Documentation

If you need help or have a question, the Yii Forum is a good place for that. You may also check out other Yii Community Resources.

License

The Yii Definitions is free software. It is released under the terms of the BSD License. Please see LICENSE for more information.

Maintained by Yii Software.

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All versions of definitions with dependencies

PHP Build Version
Package Version
Requires php Version ^8.0
psr/container Version ^1.0|^2.0
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