Home Backend Development PHP Tutorial How to use and introduce the PHP Closure class

How to use and introduce the PHP Closure class

Jun 07, 2018 am 09:30 AM

This article mainly introduces how to use the PHP Closure class. Interested friends can refer to it. I hope it will be helpful to everyone.

Closure, anonymous functions, also known as Anonymous functions, were introduced in php5.3. Anonymous function is a function without a defined name. Keep this in mind and you will be able to understand the definition of anonymous functions.

Closure class (PHP 5 >= 5.3.0) Introduction to the class used to represent anonymous functions. Anonymous functions (introduced in PHP 5.3) will generate objects of this type. Let's take a look at PHP How to use and introduce the Closure class.

PHP Closure class was introduced before in PHP predefined interface, but it is not an interface, it is an internal final class. The Closure class is used to represent anonymous functions, and all anonymous functions are instances of the Closure class.

$func = function() {
  echo 'func called';
};
var_dump($func); //class Closure#1 (0) { }
$reflect =new ReflectionClass('Closure');
var_dump(
  $reflect->isInterface(), //false
  $reflect->isFinal(), //true
  $reflect->isInternal() //true
);
Copy after login

The Closure class structure is as follows:

Closure::__construct — Constructor used to prohibit instantiation
Closure::bind — Copy a closure, Binds the specified $this object to the class scope.
Closure::bindTo — Copies the current closure object and binds the specified $this object and class scope.

Look at an example of binding $this object and scope:

class Lang
{
  private $name = 'php';
}
$closure = function () {
  return $this->name;
};
$bind_closure = Closure::bind($closure, new Lang(), 'Lang');
echo $bind_closure(); //php
Copy after login

In addition, PHP uses the magic method __invoke() to turn a class into a closure:

class Invoker {
  public function __invoke() {return __METHOD__;}
}
$obj = new Invoker;
echo $obj(); //Invoker::__invoke
Copy after login

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

PHP Mysql jQuery counts the current number of online users

php implements digital formatting, Function to add commas to every three digits of a number

PHP Chinese vertical conversion program

The above is the detailed content of How to use and introduce the PHP Closure class. 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

Hot Article

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)

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

6 Extra Skills Every PHP Developer Should Have 6 Extra Skills Every PHP Developer Should Have Feb 28, 2025 am 10:52 AM

6 Extra Skills Every PHP Developer Should Have

Understand Arrays in PHP Understand Arrays in PHP Feb 28, 2025 am 10:53 AM

Understand Arrays in PHP

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

See all articles