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 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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/14400381" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">2</div> </a> <a href="/questions/14400381" class="question-hyperlink">regex - 请帮助构建正则表达式</a> </div><div class="spacer"> <a href="/questions/14400383" title="Question score (upvotes - downvotes)"> <div class="answer-votes large">5</div> </a> <a href="/questions/14400383" class="question-hyperlink">php - 单击单选按钮后的操作</a> </div><div class="spacer"> <a href="/questions/14400385" 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