Here new function is getParameters().
This function return array with needed for bind parameters.

I see two ways to solve this.

1. Function returning a key/value array:

public array PDOStatement::getParameters ( void )

Where the array keys would be the parameter names and the array values the parameter values.
I guess this is what Mikhail suggests.

2. Introduce a PDOParameter class:
The class would look like this:

PDOParameter {

  /* Properties */
  mixed $key;
  int $dataType;
  int $length;
  mixed $value;

  /* Methods */
  public void bind ( mixed &$value [, int $data_type = PDO::PARAM_STR [, int $length [, mixed $driver_options ]]] )
}

Where $key is a string for named parameters and an integer for unnamed parameters, $dataType is one of the PDO::PARAM_* constants, $length is the length required for OUT parameters and $value is the value assigned to the parameter. bind() would work like PDOStatement::bindParam().

Having this additional class, a new parameter $params could be added to the PDOStatement class, which would be an array of PDOParameters - indexed in case of unnamed params, associative in case of named params.

Usage example with named parameters:

$sth = $dbh->prepare('SELECT name, colour, calories
    FROM fruit
    WHERE calories < :calories AND colour = :colour');
$sth->params[':calories']->bind($calories, PDO::PARAM_INT);
$sth->params[':colour']->bind(12, PDO::PARAM_STR);

Usage example with unnamed parameters:

$sth = $dbh->prepare('SELECT name, colour, calories
    FROM fruit
    WHERE calories < ? AND colour = ?');
$sth->params[0]->bind($calories, PDO::PARAM_INT);
$sth->params[1]->bind(12, PDO::PARAM_STR);

This syntax has the advantage that you can even manipulate the parameters.

As the latter includes a lot of new logic, I could also create an RFC[1] if wished.

Sebastian

[1] https://wiki.php.net/rfc