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@ 2014-10-16T00:04:03Z

<?php
$nu_array = null;
$callback = function ( $item ) use(&$callback, &$nu_array) {
    if (!is_array($item)) {
    $nu_array[] = $item;
    }
    else
    if ( is_array( $item ) ) {
     foreach( array_values($item) as $v) {
         if ( !(is_array($v))) {
             $nu_array[] = $v;
         }
         else
         { 
             $callback( $v );
         continue;
         }    
     }
    }
};
$array = array('alpha',array(1,2,3),'beta',array(7,8,array(9,10)));
array_walk_recursive($array, $callback);
print_r($nu_array);

$output = array();
array_walk_recursive($array, function ($current) use (&$output) {
    $output[] = $current;
});
print_r($output);
print "\n...................................\n";
$output = array();
array_walk($array, function ($current) use (&$output) {
    $output[] = $current;
});
print_r($output);
print "\n\n...................................\n";
$output = iterator_to_array(new RecursiveIteratorIterator(
    new RecursiveArrayIterator($array)), FALSE);
print_r($output);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => alpha [1] => 1 [2] => 2 [3] => 3 [4] => beta [5] => 7 [6] => 8 [7] => 9 [8] => 10 ) Array ( [0] => alpha [1] => 1 [2] => 2 [3] => 3 [4] => beta [5] => 7 [6] => 8 [7] => 9 [8] => 10 ) ................................... Array ( [0] => alpha [1] => Array ( [0] => 1 [1] => 2 [2] => 3 ) [2] => beta [3] => Array ( [0] => 7 [1] => 8 [2] => Array ( [0] => 9 [1] => 10 ) ) ) ................................... Array ( [0] => alpha [1] => 1 [2] => 2 [3] => 3 [4] => beta [5] => 7 [6] => 8 [7] => 9 [8] => 10 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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