如何在html的雙引號內轉義PHP？

我的代碼是如何在html的雙引號內轉義PHP？

echo '<textarea name="" class="widefat" style="width:100%; height: 100px;" value="<?php ?>"></textarea>';

如何使用PHP值

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2017-04-30 jeff

_How我可以使用php裏面的value_ **做什麼** ** – RiggsFolly

___小Note_''沒有'value'屬性 – <span class="text-secondary"> <small> <a rel="noopener" target="_blank" href="https://stackoverflow.com/users/2310830/">RiggsFolly</a></span> <span></span> </small> </span> </p> </div> </div> </div> <div itemprop="comment" class="post-comment"> <div class="row"> <div class="col-lg-1"><span class="text-secondary">+0</span></div> <div class="col-lg-11"> <p class="commenttext">@RiggsFolly - 在'echo'ed內容中執行PHP噸。 – <span class="text-secondary"> <small> <a rel="noopener" target="_blank" href="https://stackoverflow.com/users/19068/">Quentin</a></span> <span></span> </small> </span> </p> </div> </div> </div> </div> </div> </article> </div> <div class="answer-title"> <span class="text-logo margin-top-sm">A</span> <h2 class="title h4">回答</h2> </div> <div class="item-description text-md markdown-body margin-bottom-40 voidso"> <article class="board-top-1 padding-top-10"> <div class="post-col vote-info"> <span class="count">2<i class="fa fa-thumbs-up"></i></span> <i class="fa fa-check fa-2x"></i> </div> <div class="post-offset"> <div class="answer fmt"> <p>由於<a href="https://stackoverflow.com/users/19068/quentin">@quentin</a>提到，您正在嘗試<code class="prettyprint-override">echo</code> a <code class="prettyprint-override">php</code>標記，您不能。使用變量在字符串中，沒有與報價搞亂，我通常使用<a href="https://php.net/manual/en/language.types.string.php#language.types.string.syntax.heredoc" rel="nofollow noreferrer">heredoc</a>，即：</p> <pre><code class="prettyprint-override"><?php $value = 100; echo <<< EOF <textarea name="" class="widefat" style="width:100%; height: 100px;" value="{$value}"></textarea> EOF; </code></pre> </div> <div class="post-info"> <div class="post-meta row"> <p class="text-secondary col-lg-6"> <span class="source"> <a rel="noopener" target="_blank" href="https://stackoverflow.com/q/43709539">來源</a> </span> </p> <p class="text-secondary col-lg-6"> <span class="float-right date"> <span>2017-04-30 17:56:46</span> </p> <p class="col-12"></p> <p class="col-12"></p></div> </div> </div> </article> <div> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-6208739752673518" data-ad-slot="1038284119" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </div> <article class="board-top-1 padding-top-10"> <div class="post-col vote-info"> <span class="count">1<i class="fa fa-thumbs-up"></i></span> </div> <div class="post-offset"> <div class="answer fmt"> <p>你不能。</p> <p>這裏的問題與HTML無關。問題是因爲您正在嘗試<code class="prettyprint-override">echo</code> PHP標記。</p> <p>PHP輸出一切（默認）或執行PHP（在<code class="prettyprint-override"><?php</code>和<code class="prettyprint-override">?></code>之間）。如果您使用<code class="prettyprint-override">echo</code>明確輸出，則繞過解析器搜索<code class="prettyprint-override"><?php</code>。你不能以這種方式嵌套PHP程序。</p> <p>而是重構你的代碼。</p> <pre><code class="prettyprint-override">?> <textarea name="" class="widefat" style="width:100%; height: 100px;"> <?php ... ?> </textarea> <?php </code></pre> <p>注意：Textarea元素沒有值屬性。</p> </div> <div class="post-info"> <div class="post-meta row"> <p class="text-secondary col-lg-6"> <span class="source"> <a rel="noopener" target="_blank" href="https://stackoverflow.com/q/43709455">來源</a> </span> </p> <p class="text-secondary col-lg-6"> <span class="float-right date"> <span>2017-04-30 17:48:05</span> <a rel="noopener" target="_blank" href="https://stackoverflow.com/users/19068/">Quentin</a></span> </p> <p class="col-12"></p> <p class="col-12"></p></div> </div> </div> </article> <article class="board-top-1 padding-top-10"> <div class="post-col vote-info"> <span class="count">0<i class="fa fa-thumbs-up"></i></span> </div> <div class="post-offset"> <div class="answer fmt"> <p>你可以做到這一點在以下幾個方面，</p> <pre><code class="prettyprint-override">echo '<textarea name="" class="widefat" style="width:100%; height: 100px;">'.$value.'</textarea>'; </code></pre> <p>或者</p> <pre><code class="prettyprint-override"><textarea name="" class="widefat" style="width:100%; height: 100px;"><?php echo $value; ?></textarea> </code></pre> </div> <div class="post-info"> <div class="post-meta row"> <p class="text-secondary col-lg-6"> <span class="source"> <a rel="noopener" target="_blank" href="https://stackoverflow.com/q/43709699">來源</a> </span> </p> <p class="text-secondary col-lg-6"> <span class="float-right date"> <span>2017-04-30 18:13:47</span> <a rel="noopener" target="_blank" href="https://stackoverflow.com/users/4874281/">manian</a></span> </p> <p class="col-12"></p> <p class="col-12"></p></div> </div> </div> </article> </div> <div class="clearfix"> </div> <div class="relative-box"> <div class="relative">相關問題</div> <ul class="relative_list"> <li> 1. <a href="http://hk.uwenku.com/question/p-txgfmwif-bcy.html" target="_blank" title="php轉義雙引號"> php轉義雙引號 </a> </li> <li> 2. <a href="http://hk.uwenku.com/question/p-medfglbc-bkk.html" target="_blank" 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