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<?php function buildArray($array) { $new = array(); $current = &$new; foreach($array as $key => $value) { $current[$value] = array(); $current = &$current[$value]; } return $new; } $test = array ( 0 => 'Tree', 1 => 'Trunk', 2 => 'Branch', 3 => 'Limb', 4 => 'Apple', 5 => 'Seed' ); print_r(buildArray($test));

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