Home Backend Development PHP Problem How to escape html entities into characters in php

How to escape html entities into characters in php

Jan 07, 2023 pm 04:46 PM
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<blockquote><p>转义方法:1、用htmlspecialchars_decode()函数,可将5个预定义的HTML实体转为字符,语法“htmlspecialchars_decode(string,flags)”;2、用html_entity_decode()函数,可将指定HTML实体转为字符,语法“html_entity_decode(string,flags,character-set)”。</p></blockquote> <p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/024/63b9312f21be6408.jpg" class="lazy" alt="How to escape html entities into characters in php" ></p> <p>本教程操作环境:windows7系统、PHP8版、DELL G3电脑</p> <p>php提供了 两个函数来将html实体转义为字符</p> <ul style="list-style-type: disc;"> <li><p>htmlspecialchars_decode()函数</p></li> <li><p>html_entity_decode()函数</p></li> </ul> <p>下面就来了解一下这两个函数。</p> <p><strong>方法1:使用htmlspecialchars_decode()函数将html实体转义为字符</strong></p> <p>htmlspecialchars_decode() 函数把一些预定义的 HTML 实体转换为字符。</p> <p>会被解码的 HTML 实体是:</p> <ul style="list-style-type: disc;"> <li><p><code>&</code> 解码成 & (和号)</p></li> <li><p><code>"</code> 解码成 " (双引号)</p></li> <li><p><code>'</code> 解码成 <code>'</code> (单引号)</p></li> <li><p><code><</code> 解码成 <code><</code> (小于)</p></li><li><p><code>></code> 解码成 <code>></code> (大于)</p></li> </ul> <p>语法:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>htmlspecialchars_decode(string,flags)</pre><div class="contentsignin">Copy after login</div></div><table class="reference notranslate"><tbody><tr class="firstRow"><th width="20%">参数</th><th width="80%">描述</th></tr><tr><td><em>string</em></td><td>必需。规定要解码的字符串。</td></tr><tr><td><em>flags</em></td><td>可选。规定如何处理引号以及使用哪种文档类型。<p>可用的引号类型:</p><ul><li>ENT_COMPAT - 默认。仅解码双引号。</li><li>ENT_QUOTES - 解码双引号和单引号。</li><li>ENT_NOQUOTES - 不解码任何引号。</li></ul><p>规定使用的文档类型的附加 flags:</p><ul><li>ENT_HTML401 - 默认。作为 HTML 4.01 处理代码。</li><li>ENT_HTML5 - 作为 HTML 5 处理代码。</li><li>ENT_XML1 - 作为 XML 1 处理代码。</li><li>ENT_XHTML - 作为 XHTML 处理代码。</li></ul></td></tr></tbody></table><p>示例:把预定义的 HTML 实体 "<code><</code>"(小于)和 "<code>></code>"(大于)转换为字符:<br/></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>&lt;?php $str = &quot;This is some &lt;b&gt;bold&lt;/b&gt; text.&quot;; echo htmlspecialchars_decode($str); ?&gt;</pre><div class="contentsignin">Copy after login</div></div><p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/252/361/210/1673080636905307.png" class="lazy" title="1673080636905307.png" alt="How to escape html entities into characters in php"/></p><p>htmlspecialchars_decode() 函数只能转义5种HTML 实体,那么其他HTML 实体想要转义要怎么处理?可以使用html_entity_decode()函数。</p><p><strong>方法2:使用html_entity_decode()函数将html实体转义为字符</strong></p><p>html_entity_decode() 函数把 HTML 实体转换为字符。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>html_entity_decode(string,flags,character-set)</pre><div class="contentsignin">Copy after login</div></div><table class="reference"><tbody><tr class="firstRow"><th width="20%">参数</th><th width="80%">描述</th></tr><tr><td><em>string</em></td><td>必需。规定要解码的字符串。</td></tr><tr><td><em>flags</em></td><td>可选。规定如何处理引号以及使用哪种文档类型。<p>可用的引号类型:</p><ul><li>ENT_COMPAT - 默认。仅解码双引号。</li><li>ENT_QUOTES - 解码双引号和单引号。</li><li>ENT_NOQUOTES - 不解码任何引号。</li></ul><p>规定使用的文档类型的附加 flags:</p><ul><li>ENT_HTML401 - 默认。作为 HTML 4.01 处理代码。</li><li>ENT_HTML5 - 作为 HTML 5 处理代码。</li><li>ENT_XML1 - 作为 XML 1 处理代码。</li><li>ENT_XHTML - 作为 XHTML 处理代码。</li></ul></td></tr><tr><td><em>character-set</em></td><td>可选。一个规定了要使用的字符集的字符串。<p>允许的值:</p><ul><li>UTF-8 - 默认。ASCII 兼容多字节的 8 位 Unicode</li><li>ISO-8859-1 - 西欧</li><li>ISO-8859-15 - 西欧(加入欧元符号 + ISO-8859-1 中丢失的法语和芬兰语字母)</li><li>cp866 - DOS 专用 Cyrillic 字符集</li><li>cp1251 - Windows 专用 Cyrillic 字符集</li><li>cp1252 - Windows 专用西欧字符集</li><li>KOI8-R - 俄语</li><li>BIG5 - 繁体中文,主要在台湾使用</li><li>GB2312 - 简体中文,国家标准字符集</li><li>BIG5-HKSCS - 带香港扩展的 Big5</li><li>Shift_JIS - 日语</li><li>EUC-JP - 日语</li><li>MacRoman - Mac 操作系统使用的字符集</li></ul><p><strong>注释:</strong>在 PHP 5.4 之前的版本,无法被识别的字符集将被忽略并由 ISO-8859-1 替代。自 PHP 5.4 起,无法被识别的字符集将被忽略并由 UTF-8 替代。</p></td></tr></tbody></table><p>示例:</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>&lt;?php $str = &quot;&lt;&amp;copy; W3CS&amp;ccedil;h&amp;deg;&amp;deg;&amp;brvbar;&amp;sect;&gt;&quot;; echo html_entity_decode($str); ?&gt;</pre><div class="contentsignin">Copy after login</div></div><p>输出:<br/></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>&lt;© W3CSçh°°¦§&gt;</pre><div class="contentsignin">Copy after login</div></div><p>推荐学习:《<a href="https://www.php.cn/course/list/29/type/2.html" target="_blank">PHP视频教程</a>》</p>

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