Php/docs/function.array-walk-recursive
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|object &$array
, callable $callback
[, mixed $userdata
= NULL
] ) : bool
Applies the user-defined callback
function to each
element of the array
. This function will recurse
into deeper arrays.
Parameters
array
The input array.
callback
Typically,
callback
takes on two parameters. Thearray
parameter's value being the first, and the key/index second.Note:
If
callback
needs to be working with the actual values of the array, specify the first parameter ofcallback
as a reference. Then, any changes made to those elements will be made in the original array itself.userdata
If the optional
userdata
parameter is supplied, it will be passed as the third parameter to thecallback
.
Return Values
Returns TRUE
on success or FALSE
on failure.
Examples
Example #1 array_walk_recursive() example
<?php$sweet = array('a' => 'apple', 'b' => 'banana');$fruits = array('sweet' => $sweet, 'sour' => 'lemon');function test_print($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 an
array will not be passed to the function.