About how to use the Closure class in PHP

This article mainly introduces how to use the Closure class in PHP. It has a certain reference value. Now I share it with you. Friends in need can refer to it.

The Closure class is also called by everyone. Anonymous functions were introduced in php5.3. As the name suggests, an anonymous function is a function without a defined name. This article will introduce you to the use and detailed explanation of the Closure class in PHP. Friends who need it can refer to

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 has been introduced in PHP predefined interface before, 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
);

The Closure class structure is as follows:

Closure::__construct — Constructor used to prohibit instantiation
Closure::bind — Copy a closure and bind 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

In addition, PHP can use the magic method __invoke() to The class becomes a closure:

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

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