PHP PDO - How do bind named params of a prepared statement without knowing the names

Hi, I am trying to convert a helper DB query function I saw in a book to something more versatile. But when the caller provides a prepared statement with named params and its params, I am not sure how to bind them in a function.

Code:

//this is the original book function I try to update
function queryMysql($query) //it simply submits a query and returns the entire resultset
    {
        global $connection;
        $result = $connection->query($query);
        return $result;
    }

Code:

///this is my version
function queryDB(string $query, array $param=null) {
global $dbh; //reference the db handle declared in init.php

if (isset($param)) { //query params provided, so a prepared statement
  $stmt = $dbh->prepare($query); //prepared statement
  for($i = 1; $i <= count($param);$i++) { 
    $stmt->bindParam(i, $param[$i]);
  }

  $stmt->execute();

} else { //a straight sql query, not a prepared statement
  $stmt = $dbh->query($query);
}

$result = $stmt->fetchAll(); //grab entire resultset
return $result;

}

If I call queryDB($query, [$name, $age]) with an unnamed-param prepared statement such as $query = INSERT INTO users (name, age) VALUES(?, ?) and $name = "trump; $age = 18, that bindParam code should work.

But there can be times when I (or someone else) will call with a named-param prepared statement such as $query = INSERT INTO users (name, age) VALUES ( :name, :age ) and $name = "trump; $age = 18. The existing bindParam(i, $value) shouldn't work as i refers to some positional param rather than named param but the function wouldn't know those :name, :age, :whatever named parameters. How should I write the bindParam(param, value) to accommodate both named and unnamed prepared statements?

 

Check resultsetmetadata which should do a describe