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:
100
