array_walk_recursive() 函数应用

<?php

$sample = array('dog' => 'woof', 'cat' => array('angry' => 'hiss', 'happy' => 'purr'), 'aardvark' => 'kssksskss');
$output = array();

// Push all $val onto $output.
array_walk_recursive($sample, create_function('$val, $key, $obj', 'array_push($obj, $val);'), &$output);

// Printing
echo nl2br(print_r($output, true));

/*
* Array
* (
*  [0] => woof
*  [1] => hiss
*  [2] => purr
*  [3] => kssksskss
* )
*/
?>