Online PHP editor | rfc for s2PNC

@ 2016-10-25T16:56:41Z

<?php
header('Content-Type: application/json; charset="utf-8"');

/**
 * Helper function
 * 
 * @param array   $d   flat data, implementing a id/parent id (adjacency list) structure
 * @param mixed   $r   root id, node to return
 * @param string  $pk  parent id index
 * @param string  $k   id index
 * @param string  $c   children index
 * @return array
 */
function makeRecursive($d, $r = 0, $pk = 'parent', $k = 'id', $c = 'children') {
  $m = array();
  foreach ($d as $e) {
    isset($m[$e[$pk]]) ?: $m[$e[$pk]] = array();
    isset($m[$e[$k]]) ?: $m[$e[$k]] = array();
    $m[$e[$pk]][] = array_merge($e, array($c => &$m[$e[$k]]));
  }

  return $m[$r][0]; // remove [0] if there could be more than one root nodes
}

echo json_encode(makeRecursive(array(
  array('id' => 5273, 'parent' => 0,    'name' => 'John Doe'),  
  array('id' => 6032, 'parent' => 5273, 'name' => 'Sally Smith'),
  array('id' => 6034, 'parent' => 6032, 'name' => 'Mike Jones'),
  array('id' => 6035, 'parent' => 6034, 'name' => 'Jason Williams'),
  array('id' => 6036, 'parent' => 5273, 'name' => 'Sara Johnson'),
  array('id' => 6037, 'parent' => 5273, 'name' => 'Dave Wilson'),
  array('id' => 6038, 'parent' => 6037, 'name' => 'Amy Martin'),
)));

Output for git.master, git.master_jit, rfc.property-hooks: {"id":5273,"parent":0,"name":"John Doe","children":[{"id":6032,"parent":5273,"name":"Sally Smith","children":[{"id":6034,"parent":6032,"name":"Mike Jones","children":[{"id":6035,"parent":6034,"name":"Jason Williams","children":[]}]}]},{"id":6036,"parent":5273,"name":"Sara Johnson","children":[]},{"id":6037,"parent":5273,"name":"Dave Wilson","children":[{"id":6038,"parent":6037,"name":"Amy Martin","children":[]}]}]}

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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