PHP 手冊
上一頁 |  | 下一頁

# array_reduce

(PHP 4 >= 4.0.5, PHP 5)

array_reduce -- Iteratively reduce the array to a single value using a callback function

## Description

mixed array_reduce ( array input, callback function [, int initial])

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

示範 1.array_reduce() example
`<?php function rsum($v, $w) { $v += $w; return $v; } function rmul($v, $w) { $v *= $w; return $v; } $a = array(1, 2, 3, 4, 5); $x = array(); $b = array_reduce($a, "rsum"); $c = array_reduce($a, "rmul", 10); $d = array_reduce($x, "rsum", 1); ?>`

This will result in $b containing 15, $c containing 1200 (= 1*2*3*4*5*10), and $d containing 1.

See also array_filter(), array_map(), array_unique(), and array_count_values().

上一頁 | 最開頭 | 下一頁
array_rand | 上一層 | array_reverse