How can i convert ARRAY into VARIABLE?

Question

I need help in wishlist member plugin code. I need to get the level id of logged user.

<?php global $current_user;
      get_currentuserinfo();

   $my_user_id= $current_user->ID;

$mywlmapi= new WLMAPI();

$my_user_levels=$mywlmapi->GetUserLevels($my_user_id );
var_dump( $my_user_levels);

?>

Right now output is: array(1) { [1458795207]=> string(16) "Bronze per month" }

i need to store 1458795207 in var $levelid = 1458795207,

So i can echo $levelid and get the level id.

Thanks in advance.