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<?php $tree = [ 10 => [], 11 => [ 4 => [], 5 => [], 6 => [] ] ]; $path = array(11,5,0); $inseration = array('A','B'); $current = &$tree; foreach($path as $key){ $current = &$current[$key]; } $current = $inseration; print_r($tree);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [10] => Array ( ) [11] => Array ( [4] => Array ( ) [5] => Array ( [0] => Array ( [0] => A [1] => B ) ) [6] => Array ( ) ) )

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