mysqli和multi_query无法正常工作

Question

 <?php

$mysqli=mysqli_connect("localhost","root","","politicalforum");

 $query="SELECT query_title FROM administrator";
  $query.="SELECT thread_id FROM threads";

 if($mysqli->multi_query($query))
 { 
    do
    {

        if($result=$mysqli->store_result())
        {
            while($row=$result->fetch_row())
            {
                printf("%s
",$row[0]);
            }
            $result->free();
        }

        if($mysqli->more_results())
        {
            print("-------------------------------");
        }
    }while($mysql->next_result());
 }


$mysqli->close();

?>

It doesnt work.. it doesnt go to the first if condition that identifies if it is a multiquery.. I have other question, ..why are multi_query() is useful..,

UPDATE:

Strict Standards: mysqli::next_result() [mysqli.next-result]: There is no next result set. Please, call mysqli_more_results()/mysqli::more_results() to check whether to call this function/method in C:\xampp\htdocs\PoliticalForum2\test.php on line 42

SOLVED:

 <?php

$mysqli=mysqli_connect("localhost","root","","politicalforum");

 $query="SELECT query_title FROM administrator;";
  $query.="SELECT thread_id FROM threads;";

 if($mysqli->multi_query($query))
 { 
    do
    {

        if($result=$mysqli->store_result())
        {
            while($row=$result->fetch_row())
            {
                printf("%s<br/>",$row[0]);
            }
            $result->free();
        }

        if($mysqli->more_results())
        {
            print("-------------------------------<br/>");
        }
        else
        {
            echo '<br/>';
        }
    }while($mysqli->more_results() && $mysqli->next_result());
 }


$mysqli->close();

?>

Answer 1

You need a semicolon at the end of the first query.

$query="SELECT query_title FROM administrator;";
$query.="SELECT thread_id FROM threads";

mysqli::multi_query