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@ 2015-09-07T08:09:48Z

<?php
$a = array(
    null => array(1, 2, 3, 4, 5),
    2    => array(6, 7, 8, 9),
    3    => array(10, 11),
    10   => array(12),
    12   => array(13)
);

$nodes = array(
  1 => array(
    "title" => 1,
  ),
  2 => array(
    "title" => 2,
  ),
  3 => array(
    "title" => 3,
  ),
  4 => array(
    "title" => 4,
  ),
  5 => array(
    "title" => 5,
  ),
  6 => array(
    "title" => 6,
  ),
  7 => array(
    "title" => 7,
  ),
  8 => array(
    "title" => 8,
  ),
  9 => array(
    "title" => 9,
  ),
  10 => array(
    "title" => 10,
  ),
  11 => array(
    "title" => 11,
  ),
  12 => array(
    "title" => 12,
  ),
  13 => array(
    "title" => 13,
  ),
  
);

function f($node)
{
    global $nodes, $a;
    
    if (!isset($nodes[$node]["children"])) {
        $nodes[$node]["children"] = array();
    }
    
    if (isset($a[$node])) {  
        foreach($a[$node] as $child) {
                array_push($nodes[$node]["children"], f($child));
        }
    }
    
    return $nodes[$node];
}

f(null);

print_r($nodes[null]["children"]);

Output for 5.4.2 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7: Array ( [0] => Array ( [title] => 1 [children] => Array ( ) ) [1] => Array ( [title] => 2 [children] => Array ( [0] => Array ( [title] => 6 [children] => Array ( ) ) [1] => Array ( [title] => 7 [children] => Array ( ) ) [2] => Array ( [title] => 8 [children] => Array ( ) ) [3] => Array ( [title] => 9 [children] => Array ( ) ) ) ) [2] => Array ( [title] => 3 [children] => Array ( [0] => Array ( [title] => 10 [children] => Array ( [0] => Array ( [title] => 12 [children] => Array ( [0] => Array ( [title] => 13 [children] => Array ( ) ) ) ) ) ) [1] => Array ( [title] => 11 [children] => Array ( ) ) ) ) [3] => Array ( [title] => 4 [children] => Array ( ) ) [4] => Array ( [title] => 5 [children] => Array ( ) ) )

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