PHP | Ds\Set reduce() Function
Last Updated :
22 Aug, 2019
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The Ds\Set::reduce() function is an inbuilt function in PHP which is used to reduce the set to a single value by applying operations using the callback function.
Syntax:
php
php
mixed public Ds\Set::reduce ( callable $callback [, mixed $initial ] )Parameters: This function accepts two parameters as mentioned above and described below:
- $callback: This parameter holds the function which contains the operation on the elements and store carry. This callback function contains two arguments, carry and value, where carry is the value returned by the function and value is the value of the element at the current iteration.
- $initial: This parameter holds the initial value of carry, which can be NULL.
<?php
// Declare new Set
$set = new \Ds\Set([1, 2, 3, 4, 5]);
echo("Set Elements\n");
print_r($set);
// Callback function with reduce function
echo("\nElement after performing operation\n");
var_dump($set->reduce(function($carry, $element) {
return $carry + $element + 2;
}));
?>
Output:
Program 2:
Set Elements
Ds\Set Object
(
[0] => 1
[1] => 2
[2] => 3
[3] => 4
[4] => 5
)
Element after performing operation
int(25)
<?php
// Declare new Set
$set = new \Ds\Set([10, 20, 30, 40, 50]);
echo("Original set elements\n");
print_r($set);
$func_gfg = function($carry, $element) {
return $carry * $element;
};
echo("\nSet after reducing to single element\n");
// Use reduce() function
var_dump($set->reduce($func_gfg, 10));
?>
Output:
Reference: https://www.php.net/manual/en/ds-set.reduce.php
Original set elements
Ds\Set Object
(
[0] => 10
[1] => 20
[2] => 30
[3] => 40
[4] => 50
)
Set after reducing to single element
int(120000000)
