Home Backend Development PHP Tutorial PHP 5.2 vs. 5.3: Can 'new self' Replace 'new static'?

PHP 5.2 vs. 5.3: Can 'new self' Replace 'new static'?

Dec 24, 2024 am 09:41 AM

PHP 5.2 vs. 5.3: Can

Late Static Binding: Analyzing "new self" and "new static"

When transitioning a PHP library from version 5.3 to 5.2, one encounters the issue of late static binding, exemplified by code snippets like "return new static($options)". In PHP 5.2, such syntax is unavailable. This article aims to explore the nuances between "new self" and "new static" and determine if "new self" provides equivalent functionality in a PHP 5.2 environment.

The Distinction Between "new self" and "new static"

In PHP 5.2, "self" references the class in which the "new" keyword is explicitly declared. In contrast, "static", with its late static binding capabilities in PHP 5.3, points to the class from which the method was invoked within an inheritance hierarchy.

To illustrate this distinction, consider the following class structure:

class A {
    public static function get_self() {
        return new self();
    }

    public static function get_static() {
        return new static();
    }
}

class B extends A {}
Copy after login

In this example, the methods "get_self" and "get_static" are inherited in class B from class A. Invoking "get_self" in B will return an instance of class A, as the "self" reference binds to the class where the method is defined. However, invoking "get_static" in B will return an instance of class B, as "static" in late static binding will resolve to the class from which the method is called.

Applying "new static" to PHP 5.2

Unfortunately, there is no direct workaround to implement PHP 5.3's "new static" functionality in PHP 5.2. The "return new self($options)" statement will not yield the same results as it did in PHP 5.3, as "self" always refers to the class where the method is defined rather than the class from which it is invoked.

The above is the detailed content of PHP 5.2 vs. 5.3: Can 'new self' Replace 'new static'?. 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 Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Article Tags

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)

11 Best PHP URL Shortener Scripts (Free and Premium) 11 Best PHP URL Shortener Scripts (Free and Premium) Mar 03, 2025 am 10:49 AM

11 Best PHP URL Shortener Scripts (Free and Premium)

Introduction to the Instagram API Introduction to the Instagram API Mar 02, 2025 am 09:32 AM

Introduction to the Instagram API

Working with Flash Session Data in Laravel Working with Flash Session Data in Laravel Mar 12, 2025 pm 05:08 PM

Working with Flash Session Data in Laravel

Build a React App With a Laravel Back End: Part 2, React Build a React App With a Laravel Back End: Part 2, React Mar 04, 2025 am 09:33 AM

Build a React App With a Laravel Back End: Part 2, React

Simplified HTTP Response Mocking in Laravel Tests Simplified HTTP Response Mocking in Laravel Tests Mar 12, 2025 pm 05:09 PM

Simplified HTTP Response Mocking in Laravel Tests

cURL in PHP: How to Use the PHP cURL Extension in REST APIs cURL in PHP: How to Use the PHP cURL Extension in REST APIs Mar 14, 2025 am 11:42 AM

cURL in PHP: How to Use the PHP cURL Extension in REST APIs

12 Best PHP Chat Scripts on CodeCanyon 12 Best PHP Chat Scripts on CodeCanyon Mar 13, 2025 pm 12:08 PM

12 Best PHP Chat Scripts on CodeCanyon

Announcement of 2025 PHP Situation Survey Announcement of 2025 PHP Situation Survey Mar 03, 2025 pm 04:20 PM

Announcement of 2025 PHP Situation Survey

See all articles