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This article mainly introduces the relevant knowledge of "how to use the laravel contract". The editor shows you the operation process through the actual case. The operation method is simple, fast and practical. I hope this article "how to use the laravel contract" can help you solve the problem.

In laravel, contract refers to a series of interfaces that define core services provided by the framework, which are used to facilitate the development of third-party interface developers. The implementation of all contracts constitutes all the core tasks of the framework, and the role of specified functions can be understood through contracts.

This article operating environment: Windows10 system, Laravel6 version, Dell G3 computer.

What is the use of laravel contract

What's the contract?

Contract in Laravel refers to a series of interfaces provided by the framework that define core services, such as caching, queuing, and logging. Contracts are interfaces.

Why define an interface

Define the interface for decoupling

When we rely on the injection cache instance, the laravel implementation is as follows:

For example, we choose to use the memcached cache driver

Use Illuminate\ Contracts\ Cache\ Repository as Cache;class Repository {/ * create a new Repository instance * * @ param Cache $cache * @ return void * / public function _ _ construct (Cache $cache) {$this- > cache = $cache;}}

No interface defined

If we don't define the interface, we have to write like this.

Use Memcached;class Repository {/ * create a new Repository instance * * @ param Cache $cache * @ return void * / public function _ _ construct (Memcached $cache) {$this- > cache = $cache;}}

So when we need to switch the cache driver to redis, we have to go to the controller to change the type convention of dependency injection to redis, because the implementation of redis is not necessarily the same as Memcached, which means that Memcached cache is tightly coupled with laravel.

What is loose coupling?

What is loose coupling? when a system is upgraded and an implementation needs to be modified (such as upgrading from Memcached to Redis), it is loosely coupled to be able to upgrade without changing the code base, but only by modifying the configuration.

Two or more implementations of one contract

Personally, now that the contract has been decided, then the corresponding implementation should be two, or more implementations, or there will be two or more implementations in the near future. If there is only one kind of realization, it feels like the contract is useless!

That's all for the content of "how to use laravel contract". Thank you for your reading. If you want to know more about the industry, you can follow the industry information channel. The editor will update different knowledge points for you every day.

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