PHP查询

<?php
$db=new MySQLi("localhost","账号","密码","数据库名");
$sql="select * from 表名";
$r= $db->query($sql); //执行SQL语句
$attr=$r->fetch_all(); 
foreach($attr as $v) //遍历数组
{
    echo "<option value='{$v[0]}'>{$v[1]}</option>";
}

?>