php - 为什么我会失去我的 data in the $_POST?</h1> <div id="body"><p>I am writing a script that will take some form data and present it in a PDF or some other printable format. At the bottom of the form is a "New Line" button. When you click t</a></h1> <div class="ml12 aside-cta flex--item print:d-none sm:ml0 sm:mb12 sm:order-first sm:as-end"> <a href="https://stackoverflow.com/questions/ask" target="_blank" class="ws-nowrap s-btn s-btnprimary">问问题</a></div> </div> <div class="d-flex fw-wrap pb8 mb16 bb bc-black-075"> <div class="flex--item ws-nowrap mr16 mb8"> <span class="fc-light mr2"></span> </div> <div class="flex--item ws-nowrap mr16 mb8" title="2022-04-17 15:46:40Z"> <span class="fc-light mr2">问问题</span> <time itemprop="dateCreated" datetime="2012-08-28T18:51:53.083">2012-08-28T18:51:53.083</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 739 次 </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> <div class="question" data-questionid="4" data-position-on-page="0" data-score="763" id="question"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="4"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-peeufs8c"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button> <div id="--stacks-s-tooltip-peeufs8c" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question shows research effort; it is useful and clear<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value=""> -2 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-04106eqn"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button><div id="--stacks-s-tooltip-04106eqn" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This question does not show any research effort; it is unclear or not useful<div class="s-popover--arrow"></div></div> <div id="--stacks-s-tooltip-tgvwendx" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Bookmark this question.<div class="s-popover--arrow"></div></div> <a class="js-post-issue flex--item s-btn s-btnunset c-pointer py6 mx-auto" data-shortcut="T" data-ks-title="timeline" data-controller="s-tooltip" data-s-tooltip-placement="right" aria-label="Timeline" aria-describedby="--stacks-s-tooltip-abwmy15k"><svg aria-hidden="true" class="mln2 mr0 svg-icon iconHistory" width="19" height="18" viewBox="0 0 19 18"><path d="M3 9a8 8 0 1 1 3.73 6.77L8.2 14.3A6 6 0 1 0 5 9l3.01-.01-4 4-4-4h3L3 9Zm7-4h1.01L11 9.36l3.22 2.1-.6.93L10 10V5Z"></path></svg></a><div id="--stacks-s-tooltip-abwmy15k" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">Show activity on this post.<div class="s-popover--arrow"></div></div> </div> </div> <div class="postcell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> </div> <div class="mt24 mb12"> <div class="post-taglist d-flex gs4 gsy fd-column"> <div class="d-flex ps-relative fw-wrap"> <a href="/tags/php" class="post-tag js-gps-track" title="show questions tagged 'php'" rel="tag">php</a><a href="/tags/html" class="post-tag js-gps-track" title="show questions tagged 'html'" rel="tag">html</a><a href="/tags/forms" class="post-tag js-gps-track" title="show questions tagged 'forms'" rel="tag">forms</a><a href="/tags/post" class="post-tag js-gps-track" title="show questions tagged 'post'" rel="tag">post</a> </div> </div> </div> </div> <span class="d-none" itemprop="commentCount">4</span> </div> </div> <div class="js-zone-container zone-container-responsive"> <div id="dfp-isb" class="everyonelovesstackoverflow everyonelovesinline-sidebar mx-auto" style="min-height: auto; height: auto; display: none;"></div> <div class="js-report-ad-button-container mx-auto" style="width: 300px"></div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader d-flex ai-center mb8"> <div class="flex--item fl1"> <h2 class="mb0" data-answercount=""> 2 回答 <span style="display:none;" itemprop="answerCount">2</span> </h2> </div> </div> </div> <a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="1"> 1 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>看起来您正在添加具有相同 ID 的多个字段。在你的循环中，你有这个：</p> <pre><code><input type= "text" id= "qty" name= "<?php echo('qty_'.$n); ?>" maxlength "10" value= "<?php if (isset($qty[$n])) echo ($qty[$n]); ?>"/> <textarea id= "desc" name= "<?php echo('desc_'.$n); ?>" value= "<?php if (isset($desc[$n])) echo ($desc[$n]); ?>"></textarea> <input type= "text" id= "unit_price" name= "<?php echo('unit_price_'.$n); ?>" maxlength= "10" value= "<?php if (isset($unit_price[$n])) echo ($unit_price[$n]); ?>" /> <input type= "text" id= "line_total" name= "<?php echo('line_total_'.$n); ?>" maxlength= "10" value= "<?php if (isset($line_total[$n])) echo ($line_total[$n]); ?>" /> </code></pre> <p>当循环运行不止一次时，这会产生相同 id 的多个实例，这是无效的 html，并且可以解释您遇到的问题。我建议做这样的事情：</p> <pre><code> <input type="text" name="qty[]" id="<?php echo('qty_'.$n); ?>" maxlength="10" value="<?php if (isset($qty[$n])) echo ($qty[$n]); ?>"/> <textarea name="desc[]" id="<?php echo('desc_'.$n); ?>" value="<?php if (isset($desc[$n])) echo ($desc[$n]); ?>"></textarea> <input type="text" name="unit_price[]" id="<?php echo('unit_price_'.$n); ?>" maxlength="10" value="<?php if (isset($unit_price[$n])) echo ($unit_price[$n]); ?>" /> <input type="text" name="line_total[]" id= "<?php echo('line_total_'.$n); ?>" maxlength="10" value="<?php if (isset($line_total[$n])) echo ($line_total[$n]); ?>" /> </code></pre> <p>你会注意到我交换了名字和身份证。允许多个名称。更重要的是，如果你像我一样添加方括号，具有相同名称的字段将作为数组返回，这使得在后端处理它们变得非常容易。</p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2012-08-28T19:02:10.000 回答</div> </div> </div> </div> </div><a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="1"> 1 </div> <button class="js-vote-down-btn flex--item s-btn s-btn__unset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>试试看：</p> <pre><code><textarea id= "desc" name= "<?php echo('desc_'.$n); ?>"><?php if (isset($desc[$n])) echo ($desc[$n]); ?></textarea> </code></pre> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2012-08-28T18:59:38.053 回答</div> </div> </div> </div> </div></div> </div> <div id="sidebar" class="show-votes" role="complementary" aria-label="sidebar"> <div class="module sidebar-related"> <h4 id="h-related">Related</h4> <div class="related js-gps-related-questions" data-tracker="rq=1"> <div class="spacer"> <a href="/questions/19275657" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275657" class="question-hyperlink">python - Python：以数值方式查找整数的主值</a> </div><div class="spacer"> <a href="/questions/19275658" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275658" class="question-hyperlink">php - Wordpress 3.6 中的错误 php</a> </div><div class="spacer"> <a href="/questions/19275662" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275662" class="question-hyperlink">php - 使用 Wordpress 登录凭据进行外部应用登录</a> </div><div class="spacer"> <a href="/questions/19275665" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275665" class="question-hyperlink">c++ - 如何在 C++ 中围绕任意函数创建字符串参数化包装器？</a> </div><div class="spacer"> <a href="/questions/19275667" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">2</div> </a> <a href="/questions/19275667" class="question-hyperlink">sql - 在 SQL 中为 MS Access 返回特定值</a> </div><div class="spacer"> <a href="/questions/19275668" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275668" class="question-hyperlink">java - WebSphere 和 Maven 的 deployment.xml</a> </div><div class="spacer"> <a href="/questions/19275669" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">2</div> </a> <a href="/questions/19275669" class="question-hyperlink">vba - Powerpoint VBA：搜索字符箭头并用形状箭头替换</a> </div><div class="spacer"> <a href="/questions/19275670" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275670" class="question-hyperlink">html - 不需要的过渡：active css</a> </div><div class="spacer"> <a href="/questions/19275673" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275673" class="question-hyperlink">solr - Solr - 匹配多值字段的确切数量</a> </div><div class="spacer"> <a href="/questions/19275678" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">1</div> </a> <a href="/questions/19275678" class="question-hyperlink">network-programming - 如何使用c实现服务器客户端协议</a> </div> </div> </div> <div class="module js-gps-related-tags" id="related-tags"> <h4 id="h-related-tags">Reference</h4> <div data-name="javascript"> <a href="https://php.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">php</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">1429865</span> </span> </div> <div data-name="javascript"> <a href="https://c-cpp.com" class="post-tag no-tag-menu js-gps-track" target="_blank">c/c++</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">756500</span> </span> </div> <div data-name="javascript"> <a href="https://nginx.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">nginx</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49975</span> </span> </div> <div data-name="javascript"> <a href="https://mongodb.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">mongodb</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">159057</span> </span> </div> <div data-name="javascript"> <a href="https://mybatis.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">mybatis</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">3233</span> </span> </div> <div data-name="javascript"> <a href="https://anaconda.org.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">anaconda</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">13410</span> </span> </div> <div data-name="javascript"> <a href="https://pycharm.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">pycharm</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">14671</span> </span> </div> <div data-name="javascript"> <a href="https://python.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">python</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">1902243</span> </span> </div> <div data-name="javascript"> <a href="https://vscode.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">vscode</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">56040</span> </span> </div> <div data-name="javascript"> <a href="https://dockerdocs.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">docker</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">110988</span> </span> </div> <div data-name="javascript"> <a href="https://github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">github</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49000</span> </span> </div> <div data-name="javascript"> <a href="https://flask.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">flask</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">49129</span> </span> </div> <div data-name="javascript"> <a href="https://ffmpeg.github.net.cn" class="post-tag no-tag-menu js-gps-track" target="_blank">ffmpeg</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">24037</span> </span> </div> <div data-name="javascript"> <a href="https://jmeter.net" class="post-tag no-tag-menu js-gps-track" target="_blank">jmeter</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">16910</span> </span> </div> <div data-name="javascript"> <a href="https://matplotlib.net" class="post-tag no-tag-menu js-gps-track" target="_blank">matplotlib</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">63493</span> </span> </div> <div data-name="javascript"> <a href="https://getbootstrap.net" class="post-tag no-tag-menu js-gps-track" target="_blank">bootstrap</a> <span class="item-multiplier"><span class="item-multiplier-x">×</span> <span class="item-multiplier-count">54641</span> </span> </div> </div> </div> </div> </div> </div> </div> <footer id="footer" class="site-footer js-footer" role="contentinfo"> <div class="site-footer--container"> <div class="site-footer--logo"> <a href="https://stackoverflow.com"><svg aria-hidden="true" class="native svg-icon iconLogoGlyphMd" width="32" height="37" viewBox="0 0 32 37"><path d="M26 33v-9h4v13H0V24h4v9h22Z" fill="#BCBBBB"/><path d="m21.5 0-2.7 2 9.9 13.3 2.7-2L21.5 0ZM26 18.4 13.3 7.8l2.1-2.5 12.7 10.6-2.1 2.5ZM9.1 15.2l15 7 1.4-3-15-7-1.4 3Zm14 10.79.68-2.95-16.1-3.35L7 23l16.1 2.99ZM23 30H7v-3h16v3Z" fill="#F48024"/></svg></a> </div> <nav class="site-footer--nav"> <div class="site-footer--col"> <h5 class="-title"><a href="https://stackoverflow.org.cn" class="js-gps-track" data-gps-track="footer.click({ location: 3, link: 15})">Stack Overflow 中文网</a></h5> <p>遵从 CC BY-SA 知识共享许可协议。</p> </div> </nav> </div> </footer> <script> var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?709ff2ad9744e86b5b0eee677fc13ede"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); </script>  <script async src="https://www.googletagmanager.com/gtag/js?id=G-1MW5BV8G8E"></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-1MW5BV8G8E'); </script> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-6117966252207595" crossorigin="anonymous"></script> </body> </html>