Laravel - Contracts

Laravel contracts are a set of interfaces with various functionalities and core services provided by the framework.

For example,IlluminateContractsQueueQueuecontract uses a method which is needed for queuing jobs andIlluminateContractsMailMaileruses the method for sending emails.

Every contract defined includes corresponding implementation of the framework. All the Laravel contracts are available in the GitHub repository as mentioned below −

https://github.com/illuminate/contracts

This repository provides a variety of contracts available in the Laravel framework which can be downloaded and used accordingly.

Important Points

While working with Laravel contracts, please note the following important points −

• It is mandatory to define facades in the constructor of a class.

• Contracts are explicitly defined in the classes and you need not define the contracts in constructors.

Example

Consider the contract used for Authorization in Laravel which is mentioned below −

        

         Copy after login
        
       

The contract uses a function can which includes aparameternamedabilityandargumentswhich uses the user identification in the form of anarray.

You will have to define a contract as shown in the syntax below −

interface 

Contracts are used like facades for creating robust, well-tested Laravel applications. There are variouspractical differenceswith usage of contracts and facades.

The following code shows using a contract for caching a repository −

cache = $cache; } }

Contract contains no implementation and new dependencies; it is easy to write an alternative implementation of a specified contract, thus a user can replace cache implementation without modifying any code base.

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