Description:
------------
When executing an INSERT query and then immediately running PDO::lastInsertId(), the value it returns is correct. But if a SELECT query is executed in between, lastInsertId returns 0. This did not happen in PHP 5.5.9.

If you run "SELECT LAST_INSERT_ID();" as a raw query (even through PDO) the result you get is correct. 

I can't be sure if this is a bug or was changed intentionally, but I would argue it's not correct for PDO's lastInsertId to return a different value than MySQL's LAST_INSERT_ID().

Test script:
---------------
<?php

$username = "username";
$password = "password";    

$pdo = new PDO("mysql:host=127.0.0.1;port=3306;dbname=test_db", $username, $password);
    
$pdo->query("CREATE TABLE IF NOT EXISTS `test_table` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `random_field` int(11) NOT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB  DEFAULT CHARSET=utf8;");

$st = $pdo->query("INSERT INTO test_table(random_field) VALUES (" . rand(1, 100000) . ")");
    
if($st){
        echo "last_insert_id: " . $pdo->lastInsertId() . "\n";
        $pdo->query("SELECT 1 + 1");
        echo "last_insert_id: " . $pdo->lastInsertId() . "\n";
}
else {
        var_dump($pdo->errorInfo());
}

Expected result:
----------------
Both values should reflect ID of last inserted record

Actual result:
--------------
Second value is zero