How do I retrieve meta_key names with get_user_meta($user_id) call

I just figured it out. I didn’t understand associative arrays properly and after doing more research I came up with the following that works:

$user_id = 6 ;
$user_meta_array = array() ;

/* the following WordPress function outputs an associative array  */

$user_meta_array = get_user_meta($user_id);

$meta_cnt = -1 ;

/* You need the following loop structure to output nicely */

foreach($user_meta_array as $user_meta =>$mk)
{
   $meta_cnt = $meta_cnt + 1 ;
   echo('Meta Key: '.$user_meta.'<br/>');

/* Each wp_usermeta key can have multiple values  */

   $meta_vals_found = false ;
   foreach($mk as $mk_each)
   {
      if(!empty($mk_each))
      {
         $meta_vals_found = true ;
         echo('Meta Value----> '.$mk_each.'<br/>');
      } 
   }
   if(!$meta_vals_found)
   {
       echo('----> No Meta Values Entered<br/>');
   }   
}