php - 合理的安全级别与 sql 注入(inject)？

Question

我正准备启动一个网站 - 第一个我从头开始编写代码的网站。它将是低流量和低调的(可能不会被搜索引擎抓取。)我正在使用 PEAR 的 DB 库及其 query() 方法的占位符来存储用户数据，如下所示:

<?php
require_once('db.inc');
$firstname = $_POST['firstname']; 
$lastname = $_POST['lastname'];
$rsvp = $_POST['rsvp'];
$mail = $_POST['email'];
$phone = $_POST['phone'];
$lodging = $_POST['lodging'];
$extra = $_POST['extra'];
$msg = $_POST['msg'];
$password = $_POST['password'];
$id = $_POST['id'];
$username = $firstname . ' ' . $lastname;

if (isset($id)) {
  $sql = $conn->query("UPDATE guest SET username = ?, mail = ?, phone = ?, lodging = ?, extra = ?, msg = ?, role = ?, password = ?, mailed = ? WHERE id = ?", array($username, $mail, $phone, $lodging,$extra, $msg, 2, $password, 0, $id)); //TODO!! set mailed to 1 in production
  } else {
  $sql = $conn->query('INSERT INTO guest (username, password, rsvpstatus, role, mail, phone, lodging, extra, msg, mailed)VALUES (?,?,?,?,?,?,?,?)', array($username, $password, $rsvp,  2, $mail, $phone, $lodging, $extra, $msg, 1));
  }

 header('location:main.php');

与 sql 注入(inject)相比，这看起来是一个合理的保护级别吗？

Answer 1

像你这样的占位符和绑定(bind)正是对sql注入(inject)的防御。只要您从不直接将任何用户输入插入到 sql 中，就可以了。