Asked  7 Months ago    Answers:  2   Viewed   228 times

Is it possible, in PHP, to flatten a (bi/multi)dimensional array without using recursion or references?

I'm only interested in the values so the keys can be ignored, I'm thinking in the lines of array_map() and array_values().

 Answers

64

You can use the Standard PHP Library (SPL) to "hide" the recursion.

$a = array(1,2,array(3,4, array(5,6,7), 8), 9);
$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($a));
foreach($it as $v) {
  echo $v, " ";
}

prints

1 2 3 4 5 6 7 8 9 
Wednesday, March 31, 2021
 
Webroots
answered 7 Months ago
62

Use array_walk_recursive

<?php

$aNonFlat = array(
    1,
    2,
    array(
        3,
        4,
        5,
        array(
            6,
            7
        ),
        8,
        9,
    ),
    10,
    11
);

$objTmp = (object) array('aFlat' => array());

array_walk_recursive($aNonFlat, create_function('&$v, $k, &$t', '$t->aFlat[] = $v;'), $objTmp);

var_dump($objTmp->aFlat);

/*
array(11) {
  [0]=>
  int(1)
  [1]=>
  int(2)
  [2]=>
  int(3)
  [3]=>
  int(4)
  [4]=>
  int(5)
  [5]=>
  int(6)
  [6]=>
  int(7)
  [7]=>
  int(8)
  [8]=>
  int(9)
  [9]=>
  int(10)
  [10]=>
  int(11)
}
*/

?>

Tested with PHP 5.5.9-1ubuntu4.24 (cli) (built: Mar 16 2018 12:32:06)

Tuesday, June 1, 2021
 
PandemoniumSyndicate
answered 5 Months ago
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