Description:
------------
When calling PDO::prepare() on a query that is in some way invalid (references a table that doesn't exist, has a syntax error, etc), prepare() quietly returns null instead of returning a PDOStatement object or throwing an exception. This makes it awfully hard to debug anything, since the only error message you get is a "null or not an object" error when you call execute() on what you think is a PDOStatment.

prepare() should throw an exception when the sql query is malformed.

Reproduce code:
---------------
<?php

try {
    $db = new PDO("pgsql:dbname=application user=application_php password=app");
} catch (PDOException $e) {
    echo "error connecting to database: " . $e->getMessage();
    exit();
}

$query = "select * from some_non_existant_table";

$stmt = $db->prepare($query);


echo 'class name of $stmt is [' . get_class($stmt) ."]\n";

?>

Expected result:
----------------
should throw an exception

Actual result:
--------------
prints:

class name of $stmt is []