How to Flatten a Multidimensional Array?

Question

How to Flatten a Multidimensional Array?

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().

php array

3 years ago by Bharatgxwzm

2 Answers

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**vishaljlf39** · Answer 1 · 2021-08-07T10:54:17

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

**pankajshivnani123** · Answer 2 · 2021-08-09T12:43:18

As of PHP 5.3 the shortest solution seems to be array_walk_recursive() with the new closures syntax:

function flatten(array $array) {

    $return = array();

    array_walk_recursive($array, function($a) use (&$return) { $return[] = $a; });

    return $return;

}

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How to Flatten a Multidimensional Array?

2 Answers

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