PHP: array_walk_recursive function - 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.

Parameters

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

Note: 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.
userdata: If the optional userdata parameter is supplied, it will be passed as the third parameter to the callback funcname .

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.

array_walk_recursive

Description

Parameters

Return Values

Examples

See Also