国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home Backend Development PHP Tutorial Object type parameter compatibility problem in PHP interface: How to solve the 'must be compatible with' error?

Object type parameter compatibility problem in PHP interface: How to solve the 'must be compatible with' error?

Apr 01, 2025 am 11:06 AM
laravel tool

Object type parameter compatibility problem in PHP interface: How to solve the

In-depth discussion on the compatibility issues of PHP interface and object type

In PHP development, interfaces are an important tool for defining code structures and behaviors. However, in interface method parameter type declarations, type compatibility issues are often encountered, resulting in "must be compatible with" errors. This article will analyze this error in detail and provide effective solutions.

Problem scenario:

Suppose we define an interface IAdminController where the parameter type of the save method is declared as object :

 interface IAdminController {
    function save(object $request): array;
    // ... other methods
}

In the implementation class, the parameter type of the save method is AdminRequest :

 class AdminController implements IAdminController {
    function save(AdminRequest $request): array {
        // ... method implementation
    }
}

When running the code, you may get the " AdminRequest must be compatible with object " error, even if gettype($adminRequest) returns object .

Analysis of the root cause of the problem:

The key to the error is that the parameter type of the save method in the interface IAdminController is declared as object . Although AdminRequest is an instance of object type, PHP has very strict requirements on matching object types in type checking implemented by interfaces. In PHP 7.1 and previous versions, when object is used as a parameter type, the specific object type passed in must exactly match object . Although AdminRequest is an object, it is not object itself. Although PHP 7.2 and above are more relaxed in parameter hints for object type, this is not the core of the problem.

The root cause lies in the strictness of type matching. The interface defines a contract that the implementation class must be accurately abide by. As a parameter type, object is too broad to ensure the specific behavior and properties of the passed object.

Solution:

To solve this problem and avoid using too broad object types, we can adopt the following better practices:

  1. Use more specific type tips: If all xxxRequest classes inherit from the same base class (such as Laravel's Request class), you can modify the parameter type of the interface save method to that base class.

  2. Create a more specific interface: Create an interface (such as IRequest ) and let all xxxRequest classes implement the interface. Then, declare the save method parameter type of IAdminController interface as IRequest . This method not only ensures type safety, but also avoids the ambiguity of object types.

Best Practices:

It is not recommended to use object as the interface method parameter type directly because it limits the flexibility of the interface and easily leads to type compatibility issues. Selecting the appropriate parameter type according to actual needs, such as using the base class or custom interface provided by the framework, can effectively avoid such errors and improve the maintainability and readability of the code.

Through the above analysis and solutions, you can better understand the compatibility issues of object type parameters in the PHP interface and write more robust and easier to maintain PHP code.

The above is the detailed content of Object type parameter compatibility problem in PHP interface: How to solve the 'must be compatible with' error?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

The three giants in the currency circle compete! Which one is more suitable for long-term holding, Bitcoin, Ethereum, or Dogecoin? The three giants in the currency circle compete! Which one is more suitable for long-term holding, Bitcoin, Ethereum, or Dogecoin? Jul 09, 2025 pm 08:12 PM

As the digital asset market gradually matures, Bitcoin, Ethereum and Dogecoin are called the "three giants in the currency circle", attracting the attention of a large number of investors. This article will analyze their technical basis, market position, community activity and long-term potential, so as to help users understand which one is more suitable for long-term holding.

No longer blindly trading coins! Understand the true value of Bitcoin, Ethereum, Dogecoin in one article No longer blindly trading coins! Understand the true value of Bitcoin, Ethereum, Dogecoin in one article Jul 09, 2025 pm 08:15 PM

?Many people are easily influenced by market sentiment in digital currency investment, blindly following the trend but not understanding the value of the currency itself. This article will compare and analyze the core mechanisms and values ??of the three mainstream currencies, Bitcoin, Ethereum, and Dogecoin, to help readers establish rational cognition and avoid being misled by short-term fluctuations.

The popularity of the currency circle has returned, why do smart people have begun to quietly increase their positions? Look at the trend from the on-chain data and grasp the next round of wealth password! The popularity of the currency circle has returned, why do smart people have begun to quietly increase their positions? Look at the trend from the on-chain data and grasp the next round of wealth password! Jul 09, 2025 pm 08:30 PM

As the market conditions pick up, more and more smart investors have begun to quietly increase their positions in the currency circle. Many people are wondering what makes them take decisively when most people wait and see? This article will analyze current trends through on-chain data to help readers understand the logic of smart funds, so as to better grasp the next round of potential wealth growth opportunities.

How to choose Bitcoin, Ethereum, Dogecoin? The three major currencies that retail investors must understand before investing How to choose Bitcoin, Ethereum, Dogecoin? The three major currencies that retail investors must understand before investing Jul 09, 2025 pm 08:27 PM

In the virtual asset market, Bitcoin, Ethereum and Dogecoin are the three most common mainstream currencies, and many new retail investors are often confused when faced with these three. This article will compare and analyze technical characteristics, application scenarios, market performance, development ecology and community support, etc., to help investors understand the differences between these three currencies more clearly and make more appropriate choices.

The top 5 most worth investing in 2025 (with latest data) The top 5 most worth investing in 2025 (with latest data) Jul 09, 2025 am 06:06 AM

The five most valuable stablecoins in 2025 are Tether (USDT), USD Coin (USDC), Dai (DAI), First Digital USD (FDUSD) and TrueUSD (TUSD).

Still struggling with which coin to buy? Bitcoin, Ethereum, Dogecoin are suitable for different types of investors! Still struggling with which coin to buy? Bitcoin, Ethereum, Dogecoin are suitable for different types of investors! Jul 09, 2025 pm 08:09 PM

Faced with the many mainstream digital assets on the market, many novice users often don’t know how to choose. Bitcoin, Ethereum and Dogecoin are three representative digital currencies, each with their own characteristics and suitable for the people. This article will help users clearly determine which currency is more suitable for their investment strategy based on currency characteristics, development potential and user comments.

What is a stablecoin? Why are the hot searches on Douyin discussed? What is a stablecoin? Why are the hot searches on Douyin discussed? Jul 09, 2025 am 06:03 AM

Stablecoins are cryptocurrencies that are pegged to assets such as the US dollar and aim to maintain stable value. They are mainly divided into three types: fiat currency collateral, cryptocurrency collateral and algorithms. 1. Fiat currency collateral types such as USDT and USCD are supported by US dollar reserves; 2. Cryptocurrency collateral types such as DAI need to over-collateralize other currencies; 3. Algorithm relies on smart contracts to adjust supply but have high risks. The reasons why it is hotly discussed on platforms such as Douyin include: as a hedging tool when the crypto market falls, a bridge for novices to enter the crypto world, a way to obtain high-yield financial management in DeFi, and the application of low-cost cross-border payments. To obtain stablecoins, you can trade through mainstream exchanges such as Binance, Ouyi, and Huobi.

What is a stablecoin and how to buy it? What is a stablecoin and how to buy it? Jul 09, 2025 pm 07:06 PM

Stablecoins are cryptocurrencies with value pegged to the US dollar and used for hedging and trading. Its functions include as a medium of transactions and a store of value tools. The mainstream types include USDT, USDC, and BUSD. Recommended purchasing platforms include Binance, Ouyi, Huobi, Gate.io, KuCoin, Bybit. The purchase steps are: register and complete identity authentication; enter the C2C trading area; filter transaction conditions; select merchants and place orders; pay and wait for coins to be released.

See all articles