Apply a user function recursively to every member of an array (original) (raw)

array_walk_recursive

(PHP 5, PHP 7)

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

Description

array_walk_recursive ( array &$array , callable $callback [, mixed $userdata = NULL ] ) : bool

Parameters

array

The input array.

callback

Typically, callback takes on two parameters. The array parameter's value being the first, and the key/index second.

Note:

If callback needs to be working with the actual values of the array, specify the first parameter ofcallback as areference. Then, any changes made to those elements will be made in the original array itself.

userdata

If the optional userdata parameter is supplied, it will be passed as the third parameter to thecallback.

Return Values

Returns TRUE on success or FALSE on failure.

Examples

Example #1 array_walk_recursive() example

`<?php
$sweet = array('a' => 'apple', 'b' => 'banana'); fruits=array(′sweet′=>fruits = array('sweet' => fruits=array(′sweet′=>sweet, 'sour' => 'lemon');

function

test_print($item, $key)
{
echo "$key holds $item\n";
}array_walk_recursive($fruits, 'test_print');
?> `

The above example will output:

a holds apple b holds banana sour holds lemon

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

See Also

• array_walk() - Apply a user supplied function to every member of an array
• information about the callback type