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)

How to avoid risks in the turmoil in the currency circle? The TOP3 stablecoin list is revealed How to avoid risks in the turmoil in the currency circle? The TOP3 stablecoin list is revealed Jul 08, 2025 pm 07:27 PM

Against the backdrop of violent fluctuations in the cryptocurrency market, investors' demand for asset preservation is becoming increasingly prominent. This article aims to answer how to effectively hedge risks in the turbulent currency circle. It will introduce in detail the concept of stablecoin, a core hedge tool, and provide a list of TOP3 stablecoins by analyzing the current highly recognized options in the market. The article will explain how to select and use these stablecoins according to their own needs, so as to better manage risks in an uncertain market environment.

Stable coin arbitrage annualized by 20% and earn passive income using the BUSD and TUSD spreads Stable coin arbitrage annualized by 20% and earn passive income using the BUSD and TUSD spreads Jul 08, 2025 pm 07:15 PM

This article will focus on the theme of stablecoin arbitrage and explain in detail how to use the possible price spreads between stablecoins such as BUSD and TUSD to obtain profits. The article will first introduce the basic principles of stablecoin spread arbitrage, and then introduce the specific operating procedures through step-by-step explanations, and analyze the risks involved and matters that need to be paid attention to to help users understand this process and realize that its returns are not stable and unchanged.

Global stablecoin market value PK! Who is the gold substitute in the bear market Global stablecoin market value PK! Who is the gold substitute in the bear market Jul 08, 2025 pm 07:24 PM

This article will discuss the world's mainstream stablecoins and analyze which stablecoins have the risk aversion attribute of "gold substitute" in the market downward cycle (bear market). We will explain how to judge and choose a relatively stable value storage tool in a bear market by comparing the market value, endorsement mechanism, transparency, and comprehensively combining common views on the Internet, and explain this analysis process.

Must-read for beginners: The real use of Bitcoin, 99% of BTC application scenarios that novices don't know Must-read for beginners: The real use of Bitcoin, 99% of BTC application scenarios that novices don't know Jul 08, 2025 pm 06:12 PM

Many friends who are first exposed to Bitcoin may simply understand it as a high-risk investment product. This article will explore the real uses of Bitcoin beyond speculation and reveal those often overlooked application scenarios. We will start from its core design philosophy and gradually analyze how it works in different fields as a value system, helping you build a more comprehensive understanding of Bitcoin.

Yiwu merchants start charging stablecoins Yiwu merchants start charging stablecoins Jul 08, 2025 pm 11:57 PM

Under the trend of Yiwu merchants accepting stablecoin payment, it is crucial to choose a reliable exchange. This article sorts out the world's top virtual currency exchanges. 1. Binance has the largest trading volume and strong liquidity, supports multiple fiat currency deposits and exits and has a security fund; 2. OKX has a rich product line, built-in Web3 wallet, and has high asset transparency; 3. Huobi (Huobi/HTX) has a long history and a huge user base, and is actively improving security and experience; 4. Gate.io has a variety of currencies, focusing on security and audit transparency; 5. KuCoin has a friendly interface, suitable for beginners and supports automated trading; 6. Bitget is known for its derivatives and order functions, suitable for users who explore diversified strategies.

Update of the computer version registration website of the European Exchange Official web page registration portal and identity authentication process Update of the computer version registration website of the European Exchange Official web page registration portal and identity authentication process Jul 08, 2025 pm 03:42 PM

You can download and install Ouyi OKX official App through the following steps: 1. Visit Ouyi OKX official registration page to complete registration; 2. Enter your email or mobile phone number and set your password; 3. Perform identity authentication (KYC) to improve account security and permissions; 4. Submit real and valid identity information; 5. Wait for review and pass; 6. Click the official link to download the App; 7. Find the downloaded installation file and start the installation, pay attention to allowing application permissions from unknown sources; 8. Open the App and log in to the account after the installation is completed; 9. The first login requires the mobile phone or email verification code verification code verification; 10. Enable secondary verification and properly keep the account information. After completing the above steps, you can use the App to recharge, trade, and withdraw operations.

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.

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.

See all articles