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stackoverflow.com › questions › 20463 › what-is-the-point-of-interfaces-in-php

The entire point of interfaces is to give you the flexibility to have your class be forced to implement multiple interfaces, but still not allow multiple inheritance. The issues with inheriting from multiple classes are many and varied and the wikipedia page on it sums them up pretty well.

Interfaces are a compromise. Most of the problems with multiple inheritance don't apply to abstract base classes, so most modern languages these days disable multiple inheritance yet call abstract base classes interfaces and allows a class to "implement" as many of those as they want.

Answer from Craig H on Stack Overflow

PHP

php.net › manual › en › language.oop5.interfaces.php

PHP: Object Interfaces - Manual

An interface, together with type declarations, provides a good way to make sure that a particular object contains particular methods. See instanceof operator and type declarations. Learn How To Improve This Page • Submit a Pull Request • Report a Bug ... PHP prevents interface a contant to be overridden by a class/interface that DIRECTLY inherits it.

W3Schools

w3schools.com › php › php_oop_interfaces.asp

PHP OOP Interfaces

A class that implements an interface must implement all of the interface's methods. <?php interface Animal { public function makeSound(); } class Cat implements Animal { public function makeSound() { echo "Meow"; } } $animal = new Cat(); $animal->makeSound(); ?> Try it Yourself »

Discussions

oop - What is the point of interfaces in PHP? - Stack Overflow

Interfaces allow you to create code that defines the methods of classes that implement it. You cannot however add any code to those methods. Abstract classes allow you to do the same thing, along w... More on stackoverflow.com

stackoverflow.com

Composercat - Graphical User Interface for Composer

I was gonna say "what's the point" but I guess if it helps more people who are scared of the command line use Composer, it's a good thing. More on reddit.com

r/PHP

February 5, 2017

Interface Vue to a PHP MVC framework?

In the case of an API, the front end and back end (in an ideal world) are completely separated. The only interaction between them would be through REST endpoints, and which backend you use would be irrelevant to Vue.

That said, my personal favorite tool for building the API is Laravel. Laravel has route shortcuts that automatically generate REST routes for a model. For instance with a Post model, it would create routes to fetch the posts, edit a post, create a new post, etc.

Then on the front end I use vue-resource to create resources that have the same routes as my Laravel API. so in JS I would run posts.update({id: 1}, {title: "New Title"});. Since both vue-resource and Laravel use REST practices, the routes match up perfectly.

Here is an example of a Laravel REST controller. It has update, store, delete, show, and index routes. https://github.com/jsiebach/angular-todo/blob/master/app/Http/Controllers/TodoController.php

In Vue then you would just create a resource to call those using var todos = Vue.http.resource("/api/todos/:id") and it maps to the same routes. todos.delete({id: 1}) for example. Vue resources: https://github.com/vuejs/vue-resource/blob/master/docs/resource.md

Videos

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When to use Traits, Interfaces, and Abstract Classes in PHP - YouTube

Understanding Interfaces, Traits, and Namespaces in Object-Oriented ...

April 25, 2023

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PHP Interfaces & Polymorphism - Interfaces Explained - Full PHP ...

April 20, 2021

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reddit.com › r/php › i don't understand the usefulness of interface

r/PHP on Reddit: I don't understand the usefulness of Interface

March 25, 2015 -

Hi everyone.

I read some documentation about PHP Interfaces, but I still don't understand their usefulness. It talks about contracts with classes but what is a contract ?

As I understand them right now, they seem to describe functions that a class should absolutely have.

At first I though you had to write functions in the interface so they can be easily reusable between classes, but it appears that the core of the function is written in the class...

Please enlight me what is the point in this because I'm in the dark. It would be even better if you have a pertinent example to show me !

Thanks

Top answer

1 of 5

An interface is useful when you may have more than one class implementing the same types of operations. For example, suppose you are creating a cache system. You may create an interface, Cache, which defines what caches do. Next you may create several different implementations such as FileSystemCache, RedisCache, and MemcachdCache. The code that wants to cache information only uses the Cache interface. Maybe today the cache is implemented using the FileSystemCache object. As the website grows and traffic increases you see that a better cache system is required. Instead of rewriting all the places that are using the cache you can simply switch the creation of the cache from FileSystemCache to RedisCache.

2 of 5

but what is a contract ? A contract in this instance is your class saying it will have all the methods defined in the Interface. So lets take a simple interface. interface Car{ public function accelerate($peddlePercentage); public function brake($peddlePercentage); public function steer($degrees); public function getSpeed(); public function getDirection(); } Now, I am the driver and I get given a Toyota Camry class ToyotaCamry implements Car{} I dont need to look at the ToyotaCamry class to know how to drive it, why? because I know how to drive a Car. I know this Car will have a method to accelerate the car, a method to brake and a method to steer it. so if I wanted to do a test on the ToyotaCamry to see how fast it was I could do the following $toyotaCamry->accelerate(100); wait(10) echo $toyotaCamry->getSpeed(); // prints 60mph if I get given an exotic car, like a Lamborghini.. it is still a car $LambourghiniAventador->accelerate(100); wait(10) echo $LambourghiniAventador->getSpeed(); // prints 200mph Because the Lambourghini is much more powerful I have gone much faster, but how I did it was exactly the same. I could even make a function that does the test for me, it wont care what kind of Car I give it, only that It is a Car. function performAccelerationTestOnCar(Car $car) { $car->accelerate(100); wait(10); return $car->getSpeed(); } they seem to describe functions that a class should absolutely have. This is 100% correct, In the above example we described what functions and paramaters a class should have, so now My application can deal with any object that implements the class. At first I though you had to write functions in the interface so they can be easily reusable between classes, That is an Abstract Class, and a lesson for another day.

Zend

zend.com › blog › what-interface-php

PHP Interface | Interface in PHP With Examples | Zend

May 21, 2020 - A PHP interface defines a contract which a class must fulfill. If a PHP class is a blueprint for objects, an interface is a blueprint for classes. Any class implementing a given interface can be expected to have the same behavior in terms of ...

Stack Overflow

stackoverflow.com › questions › 20463 › what-is-the-point-of-interfaces-in-php

oop - What is the point of interfaces in PHP? - Stack Overflow

The concept is useful all around in object oriented programming. To me I think of an interface as a contract. So long my class and your class agree on this method signature contract we can "interface". As for abstract classes those I see as more of base classes that stub out some methods and I need to fill in the details.

GeeksforGeeks

geeksforgeeks.org › php › php-interface

PHP | Interface - GeeksforGeeks

November 3, 2018 - To implement an interface, use the implements operator as follows: ... <?php class MyClassName implements MyInterfaceName{ public function methodA() { // method A implementation } public function methodB(){ // method B implementation } } ?> ...

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Simplilearn

simplilearn.com › home › resources › software development › complex programs with interface in php

Learn What is Interface in PHP with Example | Simplilearn

July 10, 2024 - A PHP interface defines a contract which a class must fulfill. If a PHP class is a blueprint for objects, an interface is a blueprint for classes. Read more for details.

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Ash Allen Design

ashallendesign.co.uk › blog › using-interfaces-to-write-better-php-code

Using Interfaces to Write Better PHP Code | Ash Allen Design

January 2, 2024 - To allow a function or method to accept and operate on a parameter that conforms to an interface, while not caring what else the object may do or how it is implemented. These interfaces are often named like Iterable, Cacheable, Renderable, or so on to describe the significance of the behavior. Using PHP interfaces can have a number of benefits on the quality of your code.

Medium

medium.com › @maxalmonte14 › interfaces-in-php-dont-make-complete-sense-4e63be8e4233

Interfaces in PHP don’t make complete sense | by Max | Medium

April 19, 2019 - Indeed, but we are still talking about PHP 5.x, be patient, we are getting there. This problem is related to the previous one. As we already saw, an interface is a contract and must be enforced, we should remember this phrase because is !false. So, we have to question ourselves, are we really enforcing a contract if we don’t even really know what will a method return?

Tutorialspoint

tutorialspoint.com › php › php_interfaces.htm

PHP - Interfaces

In PHP, interfaces is used to define the contract that all classes have to follow. They allow several classes to use the same methods.

Medium

medium.com › @jmiqbal2019 › php-interfaces-a-guide-with-use-case-and-example-d519a6d78614

PHP Interfaces: A Guide with Use Case and Example | by Iqbal Hossen | Medium

November 8, 2024 - In PHP, an interface is a way to define a blueprint for classes, specifying methods that any class implementing the interface must have. Think of it as a contract between the interface and any class that implements it.

DEV Community

dev.to › norbybaru › how-to-use-traits-interface-and-abstract-classes-in-php-428b

How to use Traits, Interface, and Abstract classes In PHP - DEV Community

May 31, 2024 - To define a trait, use the trait ... MyClass class has access to the log method. Interfaces define a contract that must be implemented by any class that implements it....

linkedin.com › pulse › difference-between-abstract-classes-vs-interfaces-php-usman-malik-fi9ef

Difference Between Abstract Classes Vs Interfaces in PHP

February 6, 2024 - Now, let's create classes that implement the Vehicle interface to represent specific types of vehicles, such as Car and Motorcycle: <?php // Implement Car class implementing Vehicle interface class Car implements Vehicle { private $name; private $color; // Constructor public function __construct($name, $color) { $this->name = $name; $this->color = $color; } // Implement start() method for Car public function start() { return "Starting car engine..."; } // Implement getInfo() method for Car public function getInfo() { return "Name: $this->name, Color: $this->color"; } } // Implement Motorcycle

PHP

wiki.php.net › rfc › traits-with-interfaces

PHP: rfc:traits-with-interfaces

Some or all of the trait’s implementing methods may be abstract, with the class including the trait providing the method implementation (similar to an abstract class that implements an interface). Concretely, Proposal 1 makes this code be valid and functional: <?php interface I { function foo(); } trait T implements I { function foo() { } }

GeeksforGeeks

geeksforgeeks.org › php › when-do-we-need-interfaces-in-php

When do we need Interfaces in PHP? - GeeksforGeeks

July 11, 2025 - Interface constants have the same restrictions as class constants. Interface methods are implicitly abstract. Example: ... <?php interface IMyInterface { const INTERFACE_CONST_1 = 1; const INTERFACE_CONST_2 = 'a string'; public function method_1(); public function method_2(); } ?>

Dayle Rees

daylerees.com › php-interfaces-explained

PHP Interfaces Explained

January 14, 2018 - Often, I'll begin by writing the interface first, if I know what the implementations are going to need to do. We know that caches need to read and write data, and we know that they use keys to identify the cached content. Right then, let's get writing. <?php interface Cache { public function write(string $key, $value): void; public function read(string $key); }

Scaler

scaler.com › topics › php-tutorial › interface-and-abstract-class-in-php

Abstract Classes and Interfaces in PHP - Scaler Topics

November 9, 2023 - They consist only of method signatures and constants, without any implementation. Classes can implement multiple interfaces but can inherit from only one abstract class. Both abstract classes and interfaces provide a way to enforce structure, standardize behavior, and promote code reusability in PHP applications.

PHP Tutorial

phptutorial.net › home › php oop › php interface

An Essential Guide to PHP Interface By Practical Examples

July 12, 2021 - An interface allows you to specify a contract that a class must implement. To define an interface, you use the interface keyword as follows: <?php interface MyInterface { //... } Code language: HTML, XML (xml)

Phppot

phppot.com › php › php-interfaces

PHP Interfaces - Phppot

July 3, 2022 - In PHP, the interface blocks declare a set of functions to be defined with a class to implement this interface. A class can extend more than one interface, thereby, we can simulate multiple inheritances in PHP.