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@ 2017-09-21T08:29:01Z

<?php
  function array_flatten($array, $result = []) { 
    if(!is_array($array)) { 
      return false;
    }

    foreach($array as $key => $value) { 
      if(is_array($value)) { 
        $result = array_flatten($value, $result); 
      } else {
        $result[$key] = $value; 
      }
    } 

    return $result; 
  }

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

  $userdata = [
    'firstname' => 'first',
    'middlename' => 'middle',
    'lastname' => 'last',
    'address' => [ 
      'street' => 'streeeeeet',
      'housenumber' => '10'
    ]
  ];

  $addresses = array_flatten($userdata);
  
  foreach($userdata as $key => $value) {
    if(!in_array($key, $allowedKeys)) {
      unset($userdata[$key]);
    }
  }
  
  var_dump($addresses);

Output for git.master, git.master_jit, rfc.property-hooks: array(5) { ["firstname"]=> string(5) "first" ["middlename"]=> string(6) "middle" ["lastname"]=> string(4) "last" ["street"]=> string(10) "streeeeeet" ["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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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