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Informations about the package di
Dynamic Dependency Injection
This library provides a class to handle dependency injection dynamically.
Dynamic dependency injection means you don't have to define services or define which dependencies needs to be injected. The dependencies is dynamically created based on the constructor parameters.
This means you only need to add type-hints for the classes you want to inject into your class constructor.
Installation
Composer
To install this library using composer, add the following to your composer.json:
Make sure you are using composer's autoloader to include the file:
Download the file
Download Di.phar from the repo and save the file into your project path somewhere.
Usage
Getting a class with dependencies
This will give you an instance of Foo\Bar with the Baz class dynamically created and injection into the constructor.
Getting a new instance of a class
By default, the same instance for each class will be returned every time you call Di::get
If you want to return a new instance of a class, you need to pass a second parameter to the get method
This will return a new instance of the Foo\Bar class, but the dependencies will always return the same instance.
If you want to ensure that every object returns a new instance, you need to pass the Di::DEEP flag:
This will return a new instance of Foo\Bar, as well as new instances for each dependency.
Parameters
Setting parameters
If you have values in your constructor that can not be type-hinted by an object ( E.G database settings),
you use can use the map method to set the values for those parameters:
Note: If you don't specify a value for a parameter that doesn't have a type-hint, NULL will be passed as the value.
If you set a default value for the parameter, then the default value will be used instead.
Lazy loading parameters
If you want parameters to be lazy-loaded (only load when needed, E.G get value from a database or a session ), you can use a closure or valid callback as the parameter:
The function or callback will only be executed when the parameter is needed, and the value will then be cached for any further calls.
Getting parameters
To get a parameter value, just pass the Di::PARAM flag to the get method:
Over writing classes
You can also use the map method to over write a class name.
This is useful if you want to over write a core class of a library with your own implementation.
Note that your class needs to extend from the class you are over writing, otherwise you might get
an error or unexpected results.
