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# array_walk_recursive

(PHP 5)

array_walk_recursive -- Apply a user function recursively to every member of an array

## Description

bool array_walk_recursive ( array &input, callback funcname [, mixed userdata] )

Applies the user-defined function funcname to each element of the input array. This function will recur into deeper arrays. Typically, funcname takes on two parameters. The input parameter's value being the first, and the key/index second. If the optional userdata parameter is supplied, it will be passed as the third parameter to the callback funcname.

如果成功则返回 `TRUE`，失败则返回 `FALSE`。

> 注: If funcname needs to be working with the actual values of the array, specify the first parameter of funcname as a reference. Then, any changes made to those elements will be made in the original array itself.

例子 1. array_walk_recursive() example

`<?php $sweet = array('a' => 'apple', 'b' => 'banana'); $fruits = array('sweet' => $sweet, 'sour' => 'lemon'); function test_print($item, $key) { echo "$key holds $item\n"; } array_walk_recursive($fruits, 'test_print'); ?>`

上例将输出：

`a holds apple b holds banana sour holds lemon`

You may notice that the key 'sweet' is never displayed. Any key that holds an array will not be passed to the function.

See also array_walk(), and 有关 callback 类型的信息.

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array_values | 上一级 | array_walk