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  1. <?php
  2.  
  3. $topics = array(
  4.   array('name' => 'n1', 'timestamp' => 5000, 'children' => array()),
  5.   array('name' => 'n2', 'timestamp' => 4000, 'children' => array(
  6.     array('name' => 'n3', 'timestamp' => 6000, 'children' => array()),
  7.     array('name' => 'n4', 'timestamp' => 2000, 'children' => array(
  8.       array('name' => 'n5', 'timestamp' => 4000, 'children' => array()),
  9.       array('name' => 'n6', 'timestamp' => 3000, 'children' => array())
  10.     )), 
  11.   )),
  12.   array('name' => 'n7', 'timestamp' => 1000, 'children' => array())
  13. );
  14.  
  15. function sortRecurse(&$array) {
  16.     usort($array, function($a, $b) {
  17.         return $a['timestamp'] - $b['timestamp'];
  18.     });
  19.     foreach ($array as &$subarray) {
  20.         sortRecurse($subarray['children']);
  21.     }
  22. }
  23. sortRecurse($topics);
  24. print_r($topics);
Success #stdin #stdout 0.01s 23500KB
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Array
(
    [0] => Array
        (
            [name] => n7
            [timestamp] => 1000
            [children] => Array
                (
                )

        )

    [1] => Array
        (
            [name] => n2
            [timestamp] => 4000
            [children] => Array
                (
                    [0] => Array
                        (
                            [name] => n4
                            [timestamp] => 2000
                            [children] => Array
                                (
                                    [0] => Array
                                        (
                                            [name] => n6
                                            [timestamp] => 3000
                                            [children] => Array
                                                (
                                                )

                                        )

                                    [1] => Array
                                        (
                                            [name] => n5
                                            [timestamp] => 4000
                                            [children] => Array
                                                (
                                                )

                                        )

                                )

                        )

                    [1] => Array
                        (
                            [name] => n3
                            [timestamp] => 6000
                            [children] => Array
                                (
                                )

                        )

                )

        )

    [2] => Array
        (
            [name] => n1
            [timestamp] => 5000
            [children] => Array
                (
                )

        )

)
https://ideone.com/KLbQP8
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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