php如何将HTML特殊字符进行转义？PHP HTML特殊字符转义函数(转义,特殊字符,如何将....)
feifei123
发布于 2025-09-17
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<p><img src="https://img.php.cn/upload/article/001/431/639/175810296258714.png" alt="php如何将html特殊字符进行转义？php html特殊字符转义函数"></p>
&amp;amp;lt;p&amp;amp;gt;PHP要将HTML特殊字符进行转义，最核心也最常用的函数就是&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;htmlspecialchars()&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;。它能把一些在HTML中有特殊含义的字符（比如&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;<&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;、&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;>&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;、&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;amp;amp;amp;amp;&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;、&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;amp;amp;amp;quot;&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;、&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;'&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;）转换成对应的HTML实体，从而防止这些字符被浏览器误解析为HTML标签或属性，有效规避潜在的跨站脚本（XSS）攻击。&amp;amp;lt;/p&amp;amp;gt;
&amp;amp;lt;h3&amp;amp;gt;解决方案&amp;amp;lt;/h3&amp;amp;gt;
&amp;amp;lt;p&amp;amp;gt;在PHP中处理HTML特殊字符转义，&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;htmlspecialchars()&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt; 是你的首选工具。这个函数接收一个字符串，并将其中的预定义字符转换为HTML实体。&amp;amp;lt;/p&amp;amp;gt;
&amp;amp;lt;p&amp;amp;gt;&amp;amp;lt;strong&amp;amp;gt;基本用法：&amp;amp;lt;/strong&amp;amp;gt;&amp;amp;lt;/p&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class='brush:php;toolbar:false;'&amp;amp;gt;alert('You are hacked!');&amp;amp;amp;amp;amp;quot;;
$safe_output = htmlspecialchars($user_input);
echo $safe_output;
// 输出: &amp;amp;lt;script&amp;amp;gt;alert(&amp;amp;amp;amp;amp;amp;#039;You are hacked!&amp;amp;amp;amp;amp;amp;#039;);&amp;amp;lt;/script&amp;amp;gt;
$another_input = '我有一些&amp;amp;amp;amp;amp;amp;符号和&amp;amp;amp;amp;amp;quot;引号&amp;amp;amp;amp;amp;quot;';
$safe_output_2 = htmlspecialchars($another_input);
echo $safe_output_2;
// 输出: 我有一些&amp;amp;amp;amp;amp;amp;符号和&amp;amp;amp;amp;amp;quot;引号&amp;amp;amp;amp;amp;quot;
?>&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;p&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;htmlspecialchars()&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt; 函数有几个可选参数，它们能让你更精细地控制转义行为：&amp;amp;lt;/p&amp;amp;gt;
&amp;amp;lt;ol&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;
&amp;amp;lt;strong&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;$string&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/strong&amp;amp;gt;: 必需，要进行转义的字符串。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;
&amp;amp;lt;strong&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;$flags&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/strong&amp;amp;gt;: 可选，位掩码，用于指定如何处理引号以及其他字符。常用的标志有：&amp;amp;lt;ul&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ENT_COMPAT&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt; (默认): 只转换双引号，不转换单引号。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ENT_QUOTES&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;: 转换双引号和单引号。这是我个人在处理用户输入时最常使用的，因为它提供了更全面的保护。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ENT_NOQUOTES&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;: 不转换任何引号。这在某些特定场景下有用，但要慎用。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ENT_HTML5&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt; (PHP 5.4+): 使用HTML5命名实体。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ENT_XHTML&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;: 使用XHTML命名实体。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;/ul&amp;amp;gt;
&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;
&amp;amp;lt;strong&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;$encoding&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/strong&amp;amp;gt;: 可选，指定字符编码，默认为 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;ini_get(&amp;amp;amp;amp;amp;quot;default_charset&amp;amp;amp;amp;amp;quot;)&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;（通常是 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;UTF-8&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;）。明确指定编码是一个好习惯，可以避免乱码问题。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;li&amp;amp;gt;
&amp;amp;lt;strong&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;$double_encode&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/strong&amp;amp;gt;: 可选，布尔值，默认为 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;true&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;。如果设置为 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;false&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;，PHP不会对已有的HTML实体进行二次编码。比如 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;amp;amp;amp;amp;&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt; 不会变成 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;amp;amp;amp;amp;&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;。这在处理可能已经部分转义过的数据时非常有用。&amp;amp;lt;/li&amp;amp;gt;
&amp;amp;lt;/ol&amp;amp;gt;
&amp;amp;lt;p&amp;amp;gt;&amp;amp;lt;strong&amp;amp;gt;一个更健壮的例子：&amp;amp;lt;/strong&amp;amp;gt;&amp;amp;lt;/p&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class='brush:php;toolbar:false;'&amp;amp;gt; &amp;amp;amp;amp;amp;amp; have a good day!';
// 推荐的用法：转换所有引号，并明确指定UTF-8编码
$safe_comment = htmlspecialchars($malicious_comment, ENT_QUOTES | ENT_HTML5, 'UTF-8');
echo $safe_comment;
// 输出: Hello, @@##@@ &amp;amp;amp;amp;amp;amp; have a good day!
?>&amp;amp;lt;/pre&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;contentsignin&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;/div&amp;amp;gt;&amp;amp;lt;h3&amp;amp;gt;为什么对HTML特殊字符进行转义是不可或缺的安全实践？&amp;amp;lt;/h3&amp;amp;gt;
&amp;amp;lt;p&amp;amp;gt;说实话，刚开始接触Web开发时，我可能不会太在意这些小细节，觉得“不就是显示个文本嘛”。但随着对安全的深入理解，我发现对HTML特殊字符进行转义，根本上是为了防范一种非常普遍且危险的攻击手段——跨站脚本（Cross-Site Scripting, 简称XSS）。&amp;amp;lt;/p&amp;amp;gt;
&amp;amp;lt;p&amp;amp;gt;XSS攻击的核心思想是：攻击者通过某种方式（比如在评论框、个人资料、URL参数中）注入恶意脚本代码到网页中，当其他用户访问这个网页时，这些恶意脚本就会在用户的浏览器上执行。想想看，如果你的网站允许用户输入带有 &amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;div class=&amp;amp;amp;amp;amp;quot;code&amp;amp;amp;amp;amp;quot; style=&amp;amp;amp;amp;amp;quot;position:relative; padding:0px; margin:0px;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;&amp;amp;lt;pre class=&amp;amp;amp;amp;amp;quot;brush:php;toolbar:false;&amp;amp;amp;amp;amp;quot;&amp;amp;gt;