PHP保护数据库的具体代码示例
php
丢失
为
代码
例子
保护
具体
导致
带来
数据
数据库
的
示例
管理
自己
因为数据库管理不善导致数据丢失，为自己带来损失的例子不再少数。我们这次就要讲到下面代码显示了运行 SQL 语句的示例脚本。在本例中，SQL 语句是允许相同攻击的动态语句。此表单的所有者可能认为表单是安全的，因为他们已经把列名限定为选择列表。但是，代码疏忽了关于表单欺骗的最后一个习惯 — 代码将选项限定为下拉框并不意味着其他人不能够发布含有所需内容的表单（包括星号 [*]）。
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"><span class="tag-name">html</span><span class="tag">></span></span></font></strong><span> </span></span></li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">head</span><span class="tag">></span></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>SQL Injection Example</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">head</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">body</span><span class="tag">></span></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">form</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">id</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"myFrom"</font></span><span> </span><span class="attribute"><font color="#ff0000">action</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"<?php echo $_SERVER['PHP_SELF']; ?>"</font></span><span> </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">method</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"post"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">div</span><span class="tag">></span><span class="tag"><span class="tag-name">input</span></span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"text"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"account_number"</font></span><span> </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>="</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> echo(isset($_POST['account_number']) ? </span>
</li>
<li class="">
<span> $_POST['account_number'] : ''); </span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>" </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">select</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"col"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">option</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"account_number"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Account Number</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">option</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">option</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"name"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Name</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">option</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">option</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"address"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span>Address</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">option</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">select</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">input</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"Save"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span><strong><font color="#006699"><span class="tag">/></span><span class="tag"></span><span class="tag-name">div</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">form</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span>
</li>
<li class="alt"><span>if ($_POST['submit'] == 'Save') { </span></li>
<li class=""><span> /* do the form processing */ </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">link</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_connect</font></span><span>('hostname', 'user', 'password') or </span>
</li>
<li class=""><span> die ('Could not connect' . mysql_error()); </span></li>
<li class="alt"><span> mysql_select_db('test', $link); </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">col</font></span><span> = $_POST['col']; </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">select</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">"SELECT "</font></span><span> . $col . " FROM account_data WHERE </span><span class="attribute"><font color="#ff0000">account_number</font></span><span> = " </span>
</li>
<li class=""><span> . $_POST['account_number'] . ";" ; </span></li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">p</span><span class="tag">></span></span></font></strong><span>' . $select . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">p</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">result</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_query</font></span><span>($select) or die('</span><strong><font color="#006699"><span class="tag"><span class="tag-name">p</span><span class="tag">></span></span></font></strong><span>' . mysql_error() . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">p</span><span class="tag">></span></font></strong><span>'); </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">table</span><span class="tag">></span></span></font></strong><span>'; </span>
</li>
<li class="">
<span> while ($</span><span class="attribute"><font color="#ff0000">row</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_fetch_assoc</font></span><span>($result)) { </span>
</li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">tr</span><span class="tag">></span></span></font></strong><span>'; </span>
</li>
<li class="">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">td</span><span class="tag">></span></span></font></strong><span>' . $row[$col] . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">td</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">tr</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">table</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> mysql_close($link); </span></li>
<li class=""><span>} </span></li>
<li class="alt">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">body</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">html</span><span class="tag">></span></font></strong><span> </span>
</li>
</ol>登录后复制
因此，要形成PHP保护数据库的习惯，请尽可能避免使用动态 SQL 代码。如果无法避免动态 SQL 代码，请不要对列直接使用输入。下面则显示了除使用静态列外，还可以向帐户编号字段添加简单验证例程以确保输入值不是非数字值。
<ol class="dp-xml">
<li class="alt"><span><strong><font color="#006699"><span class="tag"><span class="tag-name">html</span><span class="tag">></span></span></font></strong><span> </span></span></li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">head</span><span class="tag">></span></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">title</span><span class="tag">></span></span></font></strong><span>SQL Injection Example</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">title</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">head</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">body</span><span class="tag">></span></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">form</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">id</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"myFrom"</font></span><span> </span><span class="attribute"><font color="#ff0000">action</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"<?php echo $_SERVER['PHP_SELF']; ?>"</font></span><span> </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">method</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"post"</font></span><span class="tag"><strong><font color="#006699">></font></strong></span><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"><span class="tag-name">div</span><span class="tag">></span><span class="tag"><span class="tag-name">input</span></span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"text"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"account_number"</font></span><span> </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>="</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> echo(isset($_POST['account_number']) ? </span>
</li>
<li class="">
<span> $_POST['account_number'] : ''); </span><span class="tag"><strong><font color="#006699">?></font></strong></span><span>" </span><span class="tag"><strong><font color="#006699">/></font></strong></span><span> </span><strong><font color="#006699"><span class="tag"><span class="tag-name">input</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">type</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span>
</li>
<li class="alt">
<span> </span><span class="attribute"><font color="#ff0000">value</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"Save"</font></span><span> </span><span class="attribute"><font color="#ff0000">name</font></span><span>=</span><span class="attribute-value"><font color="#0000ff">"submit"</font></span><span> </span><strong><font color="#006699"><span class="tag">/></span><span class="tag"></span><span class="tag-name">div</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">form</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">php</span></font></strong><span> </span>
</li>
<li class=""><span>function isValidAccountNumber($number) </span></li>
<li class="alt"><span>{ </span></li>
<li class=""><span> return is_numeric($number); </span></li>
<li class="alt"><span>} </span></li>
<li class=""><span>if ($_POST['submit'] == 'Save') { </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* Remember habit #1--validate your data! */ </span></li>
<li class="alt"><span> if (isset($_POST['account_number']) & </span></li>
<li class=""><span> isValidAccountNumber($_POST['account_number'])) { </span></li>
<li class="alt"><span> </span></li>
<li class=""><span> /* do the form processing */ </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">link</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_connect</font></span><span>('hostname', 'user', 'password') or </span>
</li>
<li class=""><span> die ('Could not connect' . mysql_error()); </span></li>
<li class="alt"><span> mysql_select_db('test', $link); </span></li>
<li class=""><span> </span></li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">select</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">sprintf</font></span><span>("SELECT account_number, name, address " . </span>
</li>
<li class="">
<span> " FROM account_data WHERE </span><span class="attribute"><font color="#ff0000">account_number</font></span><span> = %s;", </span>
</li>
<li class="alt"><span> mysql_real_escape_string($_POST['account_number'])); </span></li>
<li class="">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">p</span><span class="tag">></span></span></font></strong><span>' . $select . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">p</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class="alt">
<span> $</span><span class="attribute"><font color="#ff0000">result</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_query</font></span><span>($select) or die('</span><strong><font color="#006699"><span class="tag"><span class="tag-name">p</span><span class="tag">></span></span></font></strong><span>' . mysql_error() . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">p</span><span class="tag">></span></font></strong><span>'); </span>
</li>
<li class=""><span> </span></li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">table</span><span class="tag">></span></span></font></strong><span>'; </span>
</li>
<li class="">
<span> while ($</span><span class="attribute"><font color="#ff0000">row</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">mysql_fetch_assoc</font></span><span>($result)) { </span>
</li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">tr</span><span class="tag">></span></span></font></strong><span>'; </span>
</li>
<li class="">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">td</span><span class="tag">></span></span></font></strong><span>' . $row['account_number'] . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">td</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">td</span><span class="tag">></span></span></font></strong><span>' . $row['name'] . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">td</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class="">
<span> echo '</span><strong><font color="#006699"><span class="tag"><span class="tag-name">td</span><span class="tag">></span></span></font></strong><span>' . $row['address'] . '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">td</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">tr</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class=""><span> } </span></li>
<li class="alt">
<span> echo '</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">table</span><span class="tag">></span></font></strong><span>'; </span>
</li>
<li class=""><span> </span></li>
<li class="alt"><span> mysql_close($link); </span></li>
<li class=""><span> } else { </span></li>
<li class="alt">
<span> echo "</span><strong><font color="#006699"><span class="tag"><span class="tag-name">span</span></span></font></strong><span> </span><span class="attribute"><font color="#ff0000">style</font></span><span>="font-color:red"</span><span class="tag"><strong><font color="#006699">></font></strong></span><span>" . </span>
</li>
<li class="">
<span> "Please supply a valid account number!</span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">span</span><span class="tag">></span></font></strong><span>"; </span>
</li>
<li class="alt"><span> </span></li>
<li class=""><span> } </span></li>
<li class="alt"><span>} </span></li>
<li class="">
<span></span><span class="tag"><strong><font color="#006699">?></font></strong></span><span> </span>
</li>
<li class="alt">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">body</span><span class="tag">></span></font></strong><span> </span>
</li>
<li class="">
<span></span><strong><font color="#006699"><span class="tag"></span><span class="tag-name">html</span><span class="tag">></span></font></strong><span> </span>
</li>
</ol>登录后复制
在这次PHP保护数据库的例子中还展示了 mysql_real_escape_string() 函数的用法。此函数将正确地过滤您的输入，因此它不包括无效字符。如果您一直依赖于 magic_quotes_gpc，那么需要注意它已被弃用并且将在 PHP V6 中删除。从现在开始应避免使用它并在此情况下编写安全的 PHP 应用程序。此外，如果使用的是 ISP，则有可能您的 ISP 没有启用 magic_quotes_gpc。
最后，在改进的PHP保护数据库示例中，您可以看到该 SQL 语句和输出没有包括动态列选项。使用这种方法，如果把列添加到稍后含有不同信息的表中，则可以输出这些列。如果要使用框架以与数据库结合使用，则您的框架可能已经为您执行了 SQL 验证。确保查阅文档以保证框架的安全性；如果仍然不确定，请进行验证以确保稳妥。即使使用框架进行数据库交互，仍然需要执行其他验证。
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适用于 Ubuntu 和 Debian 的 PHP 8.4 安装和升级指南
Dec 24, 2024 pm 04:42 PM
PHP 8.4 带来了多项新功能、安全性改进和性能改进，同时弃用和删除了大量功能。 本指南介绍了如何在 Ubuntu、Debian 或其衍生版本上安装 PHP 8.4 或升级到 PHP 8.4
如何设置 Visual Studio Code (VS Code) 进行 PHP 开发
Dec 20, 2024 am 11:31 AM
Visual Studio Code，也称为 VS Code，是一个免费的源代码编辑器 - 或集成开发环境 (IDE) - 可用于所有主要操作系统。 VS Code 拥有针对多种编程语言的大量扩展，可以轻松编写
在PHP API中说明JSON Web令牌（JWT）及其用例。
Apr 05, 2025 am 12:04 AM
JWT是一种基于JSON的开放标准，用于在各方之间安全地传输信息，主要用于身份验证和信息交换。1.JWT由Header、Payload和Signature三部分组成。2.JWT的工作原理包括生成JWT、验证JWT和解析Payload三个步骤。3.在PHP中使用JWT进行身份验证时，可以生成和验证JWT，并在高级用法中包含用户角色和权限信息。4.常见错误包括签名验证失败、令牌过期和Payload过大，调试技巧包括使用调试工具和日志记录。5.性能优化和最佳实践包括使用合适的签名算法、合理设置有效期、
您如何在PHP中解析和处理HTML/XML？
Feb 07, 2025 am 11:57 AM
本教程演示了如何使用PHP有效地处理XML文档。 XML（可扩展的标记语言）是一种用于人类可读性和机器解析的多功能文本标记语言。它通常用于数据存储
php程序在字符串中计数元音
Feb 07, 2025 pm 12:12 PM
字符串是由字符组成的序列，包括字母、数字和符号。本教程将学习如何使用不同的方法在PHP中计算给定字符串中元音的数量。英语中的元音是a、e、i、o、u，它们可以是大写或小写。 什么是元音？ 元音是代表特定语音的字母字符。英语中共有五个元音，包括大写和小写： a, e, i, o, u 示例 1 输入：字符串 = "Tutorialspoint" 输出：6 解释 字符串 "Tutorialspoint" 中的元音是 u、o、i、a、o、i。总共有 6 个元
解释PHP中的晚期静态绑定（静态：:)。
Apr 03, 2025 am 12:04 AM
静态绑定（static::）在PHP中实现晚期静态绑定（LSB），允许在静态上下文中引用调用类而非定义类。1）解析过程在运行时进行，2）在继承关系中向上查找调用类，3）可能带来性能开销。
什么是PHP魔术方法（__ -construct，__destruct，__call，__get，__ set等）并提供用例？
Apr 03, 2025 am 12:03 AM
PHP的魔法方法有哪些？PHP的魔法方法包括：1.\_\_construct，用于初始化对象；2.\_\_destruct，用于清理资源；3.\_\_call，处理不存在的方法调用；4.\_\_get，实现动态属性访问；5.\_\_set，实现动态属性设置。这些方法在特定情况下自动调用，提升代码的灵活性和效率。
mysql：简单的概念，用于轻松学习
Apr 10, 2025 am 09:29 AM
MySQL是一个开源的关系型数据库管理系统。1）创建数据库和表：使用CREATEDATABASE和CREATETABLE命令。2）基本操作：INSERT、UPDATE、DELETE和SELECT。3）高级操作：JOIN、子查询和事务处理。4）调试技巧：检查语法、数据类型和权限。5）优化建议：使用索引、避免SELECT*和使用事务。
