PHP - array_reduce

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Metóda - array_reduce

(PHP 4 >= 4.0.5, PHP 5, PHP 7)

Iteratively reduces an array to a single value using a given callback function.

Procedurálne

• function array_reduce (array $array, callable $callback) : mixed
• function callback () : array

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$array	array		The input array to reduce.
$callback	callable		The callback function to reduce the items. $carry - The value of so far reduced items. If the actual iteration is the first one, it contains an initial value. $item - The value of the current element (of the current iteration).

Mávratovej hodnoty

Vracia: mixed

Returns the result after the reduce operation. If the array is empty and no initial value is passed, returns null.

Príklady

<?php
function sum($sumValue, $value)
{
    return $sumValue+ $value;
}

$numbers = array(1, 2, 3, 4, 5);
$nothing = array();

var_dump(array_reduce($numbers, "sum"));
var_dump(array_reduce($numbers, "sum", 10));
var_dump(array_reduce($nothing, "sum", "Initial value"));