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@ 2023-07-12T16:36:32Z

<?php


$json = '[
    {"id":3633,"name":"Mobile phones and accessories","left":1,"right":18,"level":1,"elements":0},
    {"id":3638,"name":"Mobile phones","left":2,"right":3,"level":2,"elements":174},
    
    {"id":21396,"name":"Tablets","left":19,"right":24,"level":1,"elements":0},
    {"id":21450,"name":"Some Tablets","left":20,"right":21,"level":2,"elements":8},
    {"id":21450,"name":"other Tablets","left":20,"right":21,"level":2,"elements":8}
    ]';

$data = new ArrayIterator(json_decode($json, true));

function buildTree(iterator $data, int $level = 1): array {
    
    $tree = array();
    
    
    while ($data->valid()) {
        $item = $data->current();
        
        if ($item['level'] < $level)
            return $tree;
        
        
        if ($item['level'] === $level) {
            $data->next();
            
            $tree[] = [
                'item' => $item,
                'children' => buildTree($data, $level + 1),
            ];

            
            
        }
        
    }

    return $tree;
}

$tree = buildTree($data);

print_r($tree);

?>

Output for 8.1.23 - 8.1.33, 8.2.7 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: Array ( [0] => Array ( [item] => Array ( [id] => 3633 [name] => Mobile phones and accessories [left] => 1 [right] => 18 [level] => 1 [elements] => 0 ) [children] => Array ( [0] => Array ( [item] => Array ( [id] => 3638 [name] => Mobile phones [left] => 2 [right] => 3 [level] => 2 [elements] => 174 ) [children] => Array ( ) ) ) ) [1] => Array ( [item] => Array ( [id] => 21396 [name] => Tablets [left] => 19 [right] => 24 [level] => 1 [elements] => 0 ) [children] => Array ( [0] => Array ( [item] => Array ( [id] => 21450 [name] => Some Tablets [left] => 20 [right] => 21 [level] => 2 [elements] => 8 ) [children] => Array ( ) ) [1] => Array ( [item] => Array ( [id] => 21450 [name] => other Tablets [left] => 20 [right] => 21 [level] => 2 [elements] => 8 ) [children] => Array ( ) ) ) ) )

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