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@ 2014-08-13T08:15:40Z

<?php
$input = array(
  array('sn' => 1, 'name' => 'Clement', 'upper' => 0),
  array('sn' => 2, 'name' => 'Jean',    'upper' => 1),
  array('sn' => 3, 'name' => 'Annie',   'upper' => 1),
  array('sn' => 4, 'name' => 'Yuan',    'upper' => 2),
  array('sn' => 5, 'name' => 'Mei',     'upper' => 2),
  array('sn' => 6, 'name' => 'Blue',    'upper' => 3),
  array('sn' => 7, 'name' => 'Yang',    'upper' => 5),
  array('sn' => 8, 'name' => 'Lorinda', 'upper' => 0),
);

$map = array();

foreach ($input as $node) {
  // init self
  if (!array_key_exists($node['sn'], $map)) {
    $map[$node['sn']] = array('self' => $node['name']);
  }
  else {
    $map[$node['sn']]['self'] = $node['name'];
  }

  // init parent
  if (!array_key_exists($node['upper'], $map)) {
    $map[$node['upper']] = array();
  }

  // add to parent
  $map[$node['upper']][$node['sn']] = & $map[$node['sn']];
}

print_r($map[0]);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [1] => Array ( [self] => Clement [2] => Array ( [self] => Jean [4] => Array ( [self] => Yuan ) [5] => Array ( [self] => Mei [7] => Array ( [self] => Yang ) ) ) [3] => Array ( [self] => Annie [6] => Array ( [self] => Blue ) ) ) [8] => Array ( [self] => Lorinda ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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