how extract key and valu from object

From	alex <alex@nomailno.it>
Newsgroups	comp.lang.php
Subject	how extract key and valu from object
Date	2016-07-01 10:46 +0200
Organization	Aioe.org NNTP Server
Message-ID	<nl5alr$g20$1@gioia.aioe.org> (permalink)

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with print_r ($opzioni_select);
I have this:
Array (
[all] => Select
   [0] => stdClass Object ([option] => Array ([29] => A))
   [1] => stdClass Object ([option] => Array ([28] => B ))
   [2] => stdClass Object ([option] => Array ([31] => C ))
)


after with
foreach ($opzioni_select as $key)
{
print_r ($key->option);     echo '<br>';

}

heve this:
Array ([29] => A)
Array ([28] => B)
Array ([31] => C)


I would like to create a new array
$newArr[ array_keys($key->option) ] = array_values($key->option);
but have this error: The first argument should be an array

how can get for every element the key and the value?

An array where I can to extract for every elements the key and the value

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how extract key and valu from object alex <alex@nomailno.it> - 2016-07-01 10:46 +0200
  Re: how extract key and valu from object Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-01 15:12 +0100
    Re: how extract key and valu from object alex <alex@nomailno.it> - 2016-07-02 11:30 +0200

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