PHP保护数据库的具体代码示例
php
遺失
為
程式碼
例子
保護
具體
導致
帶來
數據
資料庫
的
範例
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>登入後複製
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>登入後複製
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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記事本++7.3.1
好用且免費的程式碼編輯器
SublimeText3漢化版
中文版，非常好用
禪工作室 13.0.1
強大的PHP整合開發環境
Dreamweaver CS6
視覺化網頁開發工具
SublimeText3 Mac版
神級程式碼編輯軟體(SublimeText3)
PHP和Python：解釋了不同的範例
Apr 18, 2025 am 12:26 AM
PHP主要是過程式編程，但也支持面向對象編程（OOP）；Python支持多種範式，包括OOP、函數式和過程式編程。 PHP適合web開發，Python適用於多種應用，如數據分析和機器學習。
在PHP和Python之間進行選擇：指南
Apr 18, 2025 am 12:24 AM
PHP適合網頁開發和快速原型開發，Python適用於數據科學和機器學習。 1.PHP用於動態網頁開發，語法簡單，適合快速開發。 2.Python語法簡潔，適用於多領域，庫生態系統強大。
PHP和Python：深入了解他們的歷史
Apr 18, 2025 am 12:25 AM
PHP起源於1994年，由RasmusLerdorf開發，最初用於跟踪網站訪問者，逐漸演變為服務器端腳本語言，廣泛應用於網頁開發。 Python由GuidovanRossum於1980年代末開發，1991年首次發布，強調代碼可讀性和簡潔性，適用於科學計算、數據分析等領域。
PHP的影響：網絡開發及以後
Apr 18, 2025 am 12:10 AM
PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip
PHP與Python：用例和應用程序
Apr 17, 2025 am 12:23 AM
PHP適用於Web開發和內容管理系統，Python適合數據科學、機器學習和自動化腳本。 1.PHP在構建快速、可擴展的網站和應用程序方面表現出色，常用於WordPress等CMS。 2.Python在數據科學和機器學習領域表現卓越，擁有豐富的庫如NumPy和TensorFlow。
繼續使用PHP：耐力的原因
Apr 19, 2025 am 12:23 AM
PHP仍然流行的原因是其易用性、靈活性和強大的生態系統。 1)易用性和簡單語法使其成為初學者的首選。 2)與web開發緊密結合，處理HTTP請求和數據庫交互出色。 3)龐大的生態系統提供了豐富的工具和庫。 4)活躍的社區和開源性質使其適應新需求和技術趨勢。
PHP：服務器端腳本語言的簡介
Apr 16, 2025 am 12:18 AM
PHP是一種服務器端腳本語言，用於動態網頁開發和服務器端應用程序。 1.PHP是一種解釋型語言，無需編譯，適合快速開發。 2.PHP代碼嵌入HTML中，易於網頁開發。 3.PHP處理服務器端邏輯，生成HTML輸出，支持用戶交互和數據處理。 4.PHP可與數據庫交互，處理表單提交，執行服務器端任務。
PHP和網絡：探索其長期影響
Apr 16, 2025 am 12:17 AM
PHP在過去幾十年中塑造了網絡，並將繼續在Web開發中扮演重要角色。 1)PHP起源於1994年，因其易用性和與MySQL的無縫集成成為開發者首選。 2)其核心功能包括生成動態內容和與數據庫的集成，使得網站能夠實時更新和個性化展示。 3)PHP的廣泛應用和生態系統推動了其長期影響，但也面臨版本更新和安全性挑戰。 4)近年來的性能改進，如PHP7的發布，使其能與現代語言競爭。 5)未來，PHP需應對容器化、微服務等新挑戰，但其靈活性和活躍社區使其具備適應能力。
