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<?php function initValueIfNotSet($target, $levels = array()) { //$merge = ['WorkRecord' => ['Hours' => '']]; $merge = []; for ($i = count($levels) - 1; $i >= 0; $i--) { $current = $levels[$i]; $merge = empty($merge) ? [$current => ''] : [$current => $merge]; } //return $target + $merge; return array_merge_recursive($target, $merge); } $user = ['Details' => ['Name' => 'Kokot'], 'WorkRecord' => ['Time' => ['Minutes' => 2]]]; var_dump($user); $user = initValueIfNotSet($user, ['WorkRecord', 'Time', 'Hours']); var_dump($user);

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