Description:
------------
PDO::quote() returns NULL instead of false. Maybe only the documentation is wrong at http://at.php.net/manual/en/function.pdo-quote.php .

I currently have to use

function dbQuote($sValue) {
  return "'" . str_replace("'", "''", $sValue) . "'";
}

to quote the value. I guess the quote style depends on the real driver so that's the reason it can't be done by PDO?

Reproduce code:
---------------
$p = new PDO('odbc:driver={Microsoft Access Driver (*.mdb)};Dbq=beispieldatenbank.mdb');
var_dump($p->quote("some\\'test"));

Expected result:
----------------
bool(false)

Actual result:
--------------
NULL