PHP：如何在保持值不变的情况下从关联数组中删除键

I have an array like this.

array('root'=> array(
      'auth'=>'stringKey',
       'version'=>'4057',
       '...'=>'...'
  )
  )

Now I want to remove the outer array and root key and so I get array like below. i.e reduce it to one dimensional array

array(
  'auth'=>'stringKey',
   'version'=>'4057',
   '...'=>'...'
)

$array = array(
      'root'=> array(
           'auth'=>'stringKey',
           'version'=>'4057',
           '...'=>'...'
       )
);

print_r($array['root']);

Try this it is work for me

    <?php $myarr = array('root'=> array(
              'auth'=>'stringKey',
               'version'=>'4057',
               '...'=>'...'
          )
          );

        $array = call_user_func_array('array_merge',$myarr);
        print_r($array);

/*
output 

Array
(
    [auth] => stringKey
    [version] => 4057
    [...] => ...
)


*/
    ?>

You can overwrite the existing variable with the :

$myarray = array('root'=> array(
      'auth'=>'stringKey',
       'version'=>'4057',
       '...'=>'...'
  )
  )

$myarray = $myarray['root'];

Check demo