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<?php $rows = [ ['id' => 1, 'parent_id' => 0, 'name' => 'parent'], ['id' => 2, 'parent_id' => 1, 'name' => 'child'], ['id' => 3, 'parent_id' => 2, 'name' => 'grandchild'], ['id' => 4, 'parent_id' => 0, 'name' => 'parent 2'], ['id' => 5, 'parent_id' => 4, 'name' => 'child 2'], ['id' => 6, 'parent_id' => 1, 'name' => 'child'], ]; function buildTree(array $elements, $parentId = 0) { $branch = array(); foreach ($elements as $element) { if ($element['parent_id'] == $parentId) { $children = buildTree($elements, $element['id']); if ($children) { $element['children'] = $children; } $branch[] = $element; } } return $branch; } $tree = buildTree($rows); print_r($tree);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [id] => 1 [parent_id] => 0 [name] => parent [children] => Array ( [0] => Array ( [id] => 2 [parent_id] => 1 [name] => child [children] => Array ( [0] => Array ( [id] => 3 [parent_id] => 2 [name] => grandchild ) ) ) [1] => Array ( [id] => 6 [parent_id] => 1 [name] => child ) ) ) [1] => Array ( [id] => 4 [parent_id] => 0 [name] => parent 2 [children] => Array ( [0] => Array ( [id] => 5 [parent_id] => 4 [name] => child 2 ) ) ) )

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