object tree

<?php //php 7.0.8

​

$data = [

    ['id' => 1, 'nazwa' => 'abc',    'link' => 'abcc',   'parent' => 0],

    ['id' => 2, 'nazwa' => 'aaa',    'link' => 'bbb',    'parent' => 1],

    ['id' => 3, 'nazwa' => 'aas',    'link' => 'bbc',    'parent' => 2],

    ['id' => 4, 'nazwa' => 'asdasd', 'link' => 'adsasd', 'parent' => 2],

    ['id' => 5, 'nazwa' => 'asdasd', 'link' => 'serae',  'parent' => 4],

    ['id' => 6, 'nazwa' => 'rywer',  'link' => 'twet',   'parent' => 0],

​

];

​

$objectTree = [];

$objects = [];

​

foreach ($data as $row) {

    $obj = (object)$row;

    $obj->childs = [];

    $objects[$obj->id] = $obj;

}

​

foreach ($objects as $obj) {

    if ($obj->parent == 0) {

        $objectTree[] = $obj;

    } else {

        $objects[$obj->parent]->childs[] = $obj;

    }

}

​

var_export($objectTree);

array (
  0 => 
  stdClass::__set_state(array(
     'id' => 1,
     'nazwa' => 'abc',
     'link' => 'abcc',
     'parent' => 0,
     'childs' => 
    array (
      0 => 
      stdClass::__set_state(array(
         'id' => 2,
         'nazwa' => 'aaa',
         'link' => 'bbb',
         'parent' => 1,
         'childs' => 
        array (
          0 => 
          stdClass::__set_state(array(
             'id' => 3,
             'nazwa' => 'aas',
             'link' => 'bbc',
             'parent' => 2,
             'childs' => 
            array (
            ),
          )),
          1 => 
          stdClass::__set_state(array(
             'id' => 4,
             'nazwa' => 'asdasd',
             'link' => 'adsasd',
             'parent' => 2,
             'childs' => 
            array (
              0 => 
              stdClass::__set_state(array(
                 'id' => 5,
                 'nazwa' => 'asdasd',
                 'link' => 'serae',
                 'parent' => 4,
                 'childs' => 
                array (
                ),
              )),
            ),
          )),
        ),
      )),
    ),
  )),
  1 => 
  stdClass::__set_state(array(
     'id' => 6,
     'nazwa' => 'rywer',
     'link' => 'twet',
     'parent' => 0,
     'childs' => 
    array (
    ),
  )),
)