Example
It is possible, inside a closure, to use an external variable with the special keyword use. For instance:
<?php
$quantity = 1;
$calculator = function($number) use($quantity) {
return $number + $quantity;
};
var_dump($calculator(2)); // Shows "3"
You can go further by creating "dynamic" closures. It is possible to create a function that returns a specific calculator, depending on the quantity you want to add. For example:
<?php
function createCalculator($quantity) {
return function($number) use($quantity) {
return $number + $quantity;
};
}
$calculator1 = createCalculator(1);
$calculator2 = createCalculator(2);
var_dump($calculator1(2)); // Shows "3"
var_dump($calculator2(2)); // Shows "4"
