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<?php $tree = array('id' => 1, 'children' => array(array('id' => 2, 'children' => array('id' => 4, 'children' => false)), array('id' => 3, 'children' => false))); print_r($tree); ?>
Output for 4.3.0 - 7.1.0
Array ( [id] => 1 [children] => Array ( [0] => Array ( [id] => 2 [children] => Array ( [id] => 4 [children] => ) ) [1] => Array ( [id] => 3 [children] => ) ) )