PHP closure class

Introduction

Anonymous functions (also called lambdas) return objects of class Closure. This class has some additional methods that provide further control over anonymous functions.

Syntax

Closure {
   /* Methods */
   private __construct ( void )
   public static bind ( Closure $closure , object $newthis [, mixed $newscope = "static" ] ) : Closure
   public bindTo ( object $newthis [, mixed $newscope = "static" ] ) : Closure
   public call ( object $newthis [, mixed $... ] ) : mixed
   public static fromCallable ( callable $callable ) : Closure
}

Method

private Closure::__construct (void) — This method is only used to disable instantiation of the Closure class. Objects of this class are created by anonymous functions.

public static Closure::bind ( Closure $closure , object $newthis [, mixed $newscope = "static" ] ) − Closure — Copy using a specific binding object and class scope Closure. This method is the static version of Closure::bindTo().

public Closure::bindTo ( object $newthis [, mixed $newscope = "static" ] ) − Closure — Copy the closure using the new binding object and class scope. Creates and returns a new anonymous function with the same body and bind variables, but with a different object and new class scope.

public Closure::call ( object $newthis [, mixed $... ] ) − mixed — Temporarily bind the closure to newthis and call it with any given arguments it.

Closure Example

Online Demonstration

<?php
class A {
   public $nm;
   function __construct($x){
      $this->nm=$x;
   }
}
// Using call method
$hello = function() {
   return "Hello " . $this->nm;
};
echo $hello->call(new A("Amar")). "";;
// using bind method
$sayhello = $hello->bindTo(new A("Amar"),&#39;A&#39;);
echo $sayhello();
?>

Output

The above program displays the following output

Hello Amar
Hello Amar

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