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@ 2017-09-20T20:43:05Z

<?php
function array_flatten($array) { 
  if (!is_array($array)) { 
    return false; 
  } 
  $result = array(); 
  foreach ($array as $key => $value) { 
    if (is_array($value)) { 
      $result = array_merge($result, array_flatten($value)); 
    } else { 
      $result[$key] = $value; 
    } 
  } 
  return $result; 
}

$addresses = array_flatten([
    'firstname' => 'first',
    'middle' => 'middle',
    'lastname' => 'last',
    'address' => [ 
        'street' => 'streeeeeet',
        'housenumber' => '10'
        ]
]);


$allowedKeys = [
    'firstname',
    'middlename',
    'street',
    'lastname',
    'housenumber',
];



foreach ($allowedKeys as $key) {
    if (array_key_exists($key, $addresses)) {
        if (is_array($addresses[$key])) {
            $address[$key] = array_walk_recursive($addresses[$key], function() { 
                
            });;
        } else {
            $address[$key] = $addresses[$key];
        }
    }
}




var_dump($address);

Output for git.master, git.master_jit, rfc.property-hooks: array(4) { ["firstname"]=> string(5) "first" ["street"]=> string(10) "streeeeeet" ["lastname"]=> string(4) "last" ["housenumber"]=> string(2) "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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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