Description:
------------
use 

$str ="select @@autocommit;";
$str .= "select current_user();";

reportting errors!

-------------------------
use

$str ="select @@autocommit;";
or
$str = "select current_user();";

result is right;




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

echo "<pre>";

$mysqli = new mysqli("localhost", "root", "", "EPS");
if(mysqli_connect_errno())
    die(mysqli_connect_error());

$str ="select @@autocommit;";
$str .= "select current_user();";

$mysqli->multi_query($str) or die($mysqli->error);
do{
    if($result=$mysqli->store_result())
        while($row = $result->fetch_array())
            print_r($row);
} while($mysqli->next_result());


?>

Expected result:
----------------
print out two array

Actual result:
--------------
Unknown command