SQL注入 Less38(堆叠注入)

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<?php
if(isset($_GET['id']))
{
$id=$_GET['id'];

// connectivity
//mysql connections for stacked query examples.
$con1 = mysqli_connect($host,$dbuser,$dbpass,$dbname);
// Check connection
if (mysqli_connect_errno($con1))
{
    echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
else
{
    @mysqli_select_db($con1, $dbname) or die ( "Unable to connect to the database: $dbname");
}



$sql="SELECT * FROM users WHERE id='$id' LIMIT 0,1";
/* execute multi query */
if (mysqli_multi_query($con1, $sql))
{
    
    /* store first result set */
    if ($result = mysqli_store_result($con1))
    {
        if($row = mysqli_fetch_row($result))
        {
            echo '<font size = "5" color= "#00FF00">';	
            printf("Your Username is : %s", $row[1]);
            echo "<br>";
            printf("Your Password is : %s", $row[2]);
            echo "<br>";
            echo "</font>";
        }
//            mysqli_free_result($result);
    }
        /* print divider */
    if (mysqli_more_results($con1))
    {
            //printf("-----------------n");
    }
     //while (mysqli_next_result($con1));
}
else 
    {
	echo '<font size="5" color= "#FFFF00">';
	print_r(mysqli_error($con1));
	echo "</font>";  
    }
/* close connection */
mysqli_close($con1);


}
	else { echo "Please input the ID as parameter with numeric value";}

?>