How to replace keys with values ​​in an array?

Question

PHP

An array with data is displayed, but the keys show the id of the fields. The fields have names, how to call not the id of the fields, but the names
here

$update = $qb->DoQuery("ej1gass2x", sprintf("{'3'.XHAS.'%s'}", "a"));

foreach($update as $k => $v){
  if($k == 0) $k = 'VALUES';
  $_update[$k] = $v;
}
 
echo "<pre>";
$update = $_update;
print_r($update); 
echo "</pre>";