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<?php $keys = ["first", "second", "third"]; $array = []; foreach(array_reverse($keys) as $key) { $temp = $array; unset($array[key($array)]); $array[$key] = $temp; } $array['first']['second']['third'] = 'value'; print_r($array);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [first] => Array ( [second] => Array ( [third] => value ) ) )

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