Funcții ale tablourilor (Array)
PHP Manual

array_reduce

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

array_reduceIteratively reduce the array to a single value using a callback function

Descrierea

mixed array_reduce ( array $array , callable $callback [, mixed $initial = NULL ] )

array_reduce() applies iteratively the callback function to the elements of the array, so as to reduce the array to a single value.

Parametri

array

The input array.

callback
mixed callback ( mixed $carry , mixed $item )
carry

Holds the return value of the previous iteration; in the case of the first iteration it instead holds the value of initial.

item

Holds the value of the current iteration.

initial

If the optional initial is available, it will be used at the beginning of the process, or as a final result in case the array is empty.

Valorile întoarse

Returns the resulting value.

If the array is empty and initial is not passed, array_reduce() returns NULL.

Istoricul schimbărilor

Versiune Descriere
5.3.0 Changed initial to allow mixed, previously integer.

Exemple

Example #1 array_reduce() example

<?php
function sum($carry$item)
{
    
$carry += $item;
    return 
$carry;
}

function 
product($carry$item)
{
    
$carry *= $item;
    return 
$carry;
}

$a = array(12345);
$x = array();

var_dump(array_reduce($a"sum")); // int(15)
var_dump(array_reduce($a"product"10)); // int(1200), because: 10*1*2*3*4*5
var_dump(array_reduce($x"sum""No data to reduce")); // string(17) "No data to reduce"
?>

A se vedea și


Funcții ale tablourilor (Array)
PHP Manual