PHP 7 Closure call( ) Method - Coding

PHP 7 Closure::call() method can bind an object scope, along with calling the closure temporarily. It takes the argument as an object and a variable number of parameters to be bound.

Syntax:

public Closure::call(object $newThis, mixed ...$args): mixed

Parameters: It takes two parameters, which are described below:

$newThis: This parameter represents an object that is used to bind the closure while making the call.
$args: This parameter specifies the number of arguments, i.e. more than zero, that will be passed as parameters to the closure.

Return Value: The return value for the Closure will be returned by this function.

Example 1: This code snippet declares a class “Person” with a constructor that takes two arguments $name and $age. It then creates an instance of the “Person” class and assigns it to the variable $person. Finally, it prints the person’s name and age using the getName() and getAge() methods of the $person object.

PHP

<?php 
class Person 
{ 
    private $name; 
    private $age; 
  
    public function __construct($name, $age) 
    { 
        $this->name = $name; 
        $this->age = $age; 
    } 
  
    public function getName() 
    { 
        return $this->name; 
    } 
  
    public function getAge() 
    { 
        return $this->age; 
    } 
} 
  
$person = new Person("Geek", 23); 
echo "Name: " . $person->getName() . "\n"; 
echo "Age: " . $person->getAge() . "\n"; 
?>

Output:

Name: Geek
Age: 23

Example 2:The code defines a “Geekcalculator” class with an add() method that creates a closure to call the add() method of the current object. It then uses the Closure::call() method to call the closure with the current object and the given arguments. The result is returned and printed on the screen.

PHP

<?php 
class Geekcalculator 
{ 
    public function add($a, $b) 
    { 
        // Create a closure that calls the `addNumbers`  
        // method of the current object 
        $sum = function ($c, $d) { 
            return $this->addNumbers($c, $d); 
        }; 
  
        // Call the closure with $a and $b as arguments 
        return $sum($a, $b); 
    } 
  
    // `addNumbers` method simply adds two numbers 
    public function addNumbers($x, $y) 
    { 
        return $x + $y; 
    } 
} 
  
// Create an instance of the `Geekcalculator` class 
$calculator = new Geekcalculator(); 
  
// Call the `add` method with arguments 69 and 31 
// the `add` method creates a closure that calls 
// the `addNumbers` method of the `Geekcalculator` 
// object, and then calls that closure with 
// the provided arguments 
$result = $calculator->add(69, 31); 
  
// Output the result 
echo $result; 
?>

Output:

Reference: https://www.php.net/manual/en/closure.call.php

Reffered: https://www.geeksforgeeks.org

PHP

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Category:	Coding
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