Online PHP editor | rfc for mutdR

@ 2020-12-21T01:57:18Z

<?php

$testArray = [
  ['lev 1' => 'lev 1'],
  ['lev 2', 'lev 2 - 1', ['lev 2 - 2'], ['Key preserved' => 'lev 2 - 3']],
  [['lev 3 - 1', 'lev 3 - 2', 'lev 3 - 3']],
  [[[888 => 'lev 4']]]
];

// $element must initially be an array. Anything that is not an array will just return the accumulator.
function flatten($element, $accum = []) {

  // If we don't have an array return the accumulator.
  if (!is_array($element)) {
     return $accum;
  }

  foreach($element as $key => $e) {
    // Check if the elements are an array or not. If not, append the accumulator with a key and value.
    if (!is_array($e)) {
      // Check that the key does not already exist, if it does we have to simply append to preserve values.
      if (array_key_exists($key, $accum)) {
        $accum[] = $e;
      } else {
        $accum[$key] = $e;
      }
    }

    // Only recurse when we have an array.
    if (is_array($e)) {
      // We pass in the accumulator and any values further down then hierachy.
      $vals = flatten($e, $accum);

      // We might get an empty array back if there was an array of arrays.
      if (!empty($vals)) {
        // We don't append our values here, we override the accumulator. The appending happens above when $e is not an
        // array.
        $accum = $vals;
      }
    }
  }

  // Return values of this array and all child arrays.  
  return $accum;
}

var_dump(flatten($testArray));

Output for git.master, git.master_jit, rfc.property-hooks: array(9) { ["lev 1"]=> string(5) "lev 1" [0]=> string(5) "lev 2" [1]=> string(9) "lev 2 - 1" [2]=> string(9) "lev 2 - 2" ["Key preserved"]=> string(9) "lev 2 - 3" [3]=> string(9) "lev 3 - 1" [4]=> string(9) "lev 3 - 2" [5]=> string(9) "lev 3 - 3" [888]=> string(5) "lev 4" }

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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

preferences:dark modelive preview