Vector
PHP Manual

Ds\Vector::reduce

(PECL ds >= 1.0.0)

Ds\Vector::reduceReduces the vector to a single value using a callback function.

Açıklama

public mixed Ds\Vector::reduce ( callable $callback [, mixed $initial ] )

Reduces the vector to a single value using a callback function.

Değiştirgeler

callback
mixed callback ( mixed $carry , mixed $value )
carry

The return value of the previous callback, or initial if it's the first iteration.

value

The value of the current iteration.

initial

The initial value of the carry value. Can be NULL.

Dönen Değerler

The return value of the final callback.

Örnekler

Örnek 1 Ds\Vector::reduce() with initial value example

<?php
$vector 
= new \Ds\Vector([123]);

$callback = function($carry$value) {
    return 
$carry $value;
};

var_dump($vector->reduce($callback5));

// Iterations:
//
// $carry = $initial = 5
//
// $carry = $carry * 1 =  5
// $carry = $carry * 2 = 10
// $carry = $carry * 3 = 30
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

int(30)

Örnek 2 Ds\Vector::reduce() without an initial value example

<?php
$vector 
= new \Ds\Vector([123]);

var_dump($vector->reduce(function($carry$value) {
    return 
$carry $value 5;
}));

// Iterations:
//
// $carry = $initial = null
//
// $carry = $carry + 1 + 5 =  6
// $carry = $carry + 2 + 5 = 13
// $carry = $carry + 3 + 5 = 21
?>

Yukarıdaki örnek şuna benzer bir çıktı üretir:

int(21)

Vector
PHP Manual