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PHP Manual

Array Functions
PHP Manual

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 , callable $funcname [, mixed $userdata = NULL ] )

Applies the user-defined function funcname to each element of the input array. This function will recurse 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.

See Also

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

Array Functions
PHP Manual


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PHP-Index
  1. Introduction
  2. Installation and Configuration
  3. Language reference
  4. Security
  5. Features
  6. Function reference
  7. PHP and zend engine internal
  8. FAQ: Frequently Asked Questions
  9. Appendices



 

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