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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, string 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.

成功回傳`TRUE`失敗回傳`FALSE`。

> 備注: 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.

示範 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'); ?>`
The printout of the program above will be:
`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().

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