执行多个针对数据库的查询：

<?php
$con=mysqli_connect("localhost","my_user","my_password","my_db");
// 检测链接
if (mysqli_connect_errno($con))
{
    echo "连接到 MySQL 失败: " . mysqli_connect_error();
}
 
$sql = "SELECT Lastname FROM Persons ORDER BY LastName;";
$sql .= "SELECT Country FROM Customers";
 
// 执行多个 SQL 语句
if (mysqli_multi_query($con,$sql))
{
    do
    {
        // 存储第一个结果集
        if ($result=mysqli_store_result($con))
        {
            while ($row=mysqli_fetch_row($result))
            {
                printf("%sn",$row[0]);
            }
            mysqli_free_result($result);
        }
    }
    while (mysqli_next_result($con));
}
 
mysqli_close($con);
?>