您的位置: 首页 > 技术问答 > PHP：如何检查是否具有DOMDocument的子节点？ </a> </div> <div class="entry"> <div class="entry-head"> <h1 class="entry-title"> PHP：如何检查<p>是否具有DOMDocument的<iframe>子节点？ </h1> <div class="entry-info"> <span> 分类: <a href="//" target="_blank"> 技术问答 </a> </span> <span class="dot">•</span> <span> 2022-03-10 21:56:37 </span> </div> </div> <div class="entry-content clearfix"> <div class="wenti_miaoshu"> <div class="ask_miaoshu"> 问题描述：</div> <p class="wenti_jieda"> <div itemprop="text"> <p>How can I check if a <code>p</code> has a child node of <code>iframe</code> with <code>DOMDocument</code>?</p> <p>For instance,</p> <pre><code><p><iframe ....></p> </code></pre> <p>I want to print this only,</p> <pre><code><iframe ....> </code></pre> <p>While,</p> <pre><code><p>bla bla bal</p> </code></pre> <p>then do nothing or just print whatever inside the p,</p> <pre><code><p>bla bla bal</p> </code></pre> <p>Or, </p> <pre><code><p>bla bla <b>bal</b></p> </code></pre> <p>then do nothing or just print whatever inside the p,</p> <pre><code><p>bla bla <b>bal</b></p> </code></pre> <p>my php,</p> <pre><code>$dom = new DOMDocument; $dom->loadHTML($item_html); if($dom->getElementsByTagName('p')->length > 1 ) { ... } else // if it is only a single paragraph... then do what I want above... { foreach ($dom->getElementsByTagName('p') as $node) { if ($node->hasChildNodes()) { foreach( $dom->getElementsByTagName('iframe') as $iframe ) { ... something } } else { ... } } } </code></pre> <p>is it possible?</p> </div> </p> </div> <div class="wentijida_box"> <div class="wentijida_box_content"> <span class="answer-span"> 答 </span> <p> <div class="content rich-text blog-content-box htmledit_views" ><div itemprop="text"> <p>You're trying to find all iframe elements that are the only childnodes of the p elements.</p> <p>If found you want to replace their parent p element with them.</p> <pre><code>/** @var DOMElement $p */ foreach ($doc->getElementsByTagName('p') as $p) { if ($p->childNodes->length !== 1) { continue; } $child = $p->childNodes->item(0); if (! $child instanceof DOMElement) { continue; } if ($child->tagName !== 'iframe') { continue; } $p->parentNode->insertBefore($child, $p); $p->parentNode->removeChild($p); } </code></pre> <p>This foreach loop just iterates over all p elements, ignores all that don't have a single child node that is not a DOMElement with the iframe tagname (note: always lowercase in the compare).</p> <p>If one p element is found, then the inner iframe is moved before it and then the paragraph is removed.</p> <p>Usage Example:</p> <pre><code><?php /** * @link http://stackoverflow.com/q/19021983/367456 */ $html = ' <p><iframe src="...."></p> <p>bla bla bal</p> <p>bla bla <b>bal</b></p> <p></p> '; $doc = new DOMDocument(); $doc->loadHTML($html); /** @var DOMElement[] $ps */ // $ps = $; /** @var DOMElement $p */ foreach ($doc->getElementsByTagName('p') as $p) { if ($p->childNodes->length !== 1) { continue; } $child = $p->childNodes->item(0); if (!$child instanceof DOMElement) { continue; } if ($child->tagName !== 'iframe') { continue; } $p->parentNode->insertBefore($child, $p); $p->parentNode->removeChild($p); } // output foreach ($doc->getElementsByTagName('body')->item(0)->childNodes as $child) { echo $doc->saveHTML($child); } </code></pre> <p><a rel="nofollow">Demo</a> and Output:</p> <pre><code><iframe src="...."></iframe> <p>bla bla bal</p> <p>bla bla <b>bal</b></p> <p></p> </code></pre> <p>Hope this is helpful. </p> </div></div> <div ></div> </p> </div> </div> <div class="wentijida_box"> <div class="wentijida_box_content"> <span class="answer-span"> 答 </span> <p> <div class="content rich-text blog-content-box htmledit_views" ><div itemprop="text"> <p>So do this:</p> <pre><code> $dom = new DOMDocument; $dom->loadHTML($item_html); if($dom->getElementsByTagName('p')->length > 1 ) { ... } else // if it is only a single paragraph... then do what I want above... { foreach ($dom->getElementsByTagName('p') as $node) { if ($node->hasChildNodes()) { if($dom->getElementsByTagName('iframe')->length > 0 ) { foreach( $dom->getElementsByTagName('iframe') as $iframe ) { ... something } } } else { ... } } } </code></pre> </div></div> <div ></div> </p> </div> </div> </div> <div class="entry-footer"> <h3 class="entry-related-title"> 相关推荐 </h3> <ul class="entry-related clearfix"> <li> <a href="/article/494861.html" title="PHP：如何检查<p>是否具有DOMDocument的<iframe>子节点？" target="_blank"> PHP：如何检查<p>是否具有DOMDocument的<iframe>子节点？ </a> </li> <li> <a href="/article/172977.html" title="PHP：如何检查< p>子节点为< iframe>与DOMDocument？" target="_blank"> PHP：如何检查< p>子节点为< iframe>与DOMDocument？ </a> </li> <li> <a href="/article/494860.html" title="使用DOMxpath或regex删除<p> <br/> </ p>？" target="_blank"> 使用DOMxpath或regex删除<p> <br/> </ p>？ </a> </li> <li> <a href="/article/494862.html" title="正则表达式匹配p标签并在其中添加br" target="_blank"> 正则表达式匹配p标签并在其中添加br </a> </li> </ul> </div> </div> </article> </div> </div> </div> <footer class="footer"> <div class="container"> <div class="clearfix"> <div class="footer-col footer-col-copy"> <div class="menu"> <ul> <a href="/mianze.html" target="_blank" title="网站免责声明"> 网站免责声明 </a> <a href="/sitemap.xml" title="网站地图"> 网站地图 </a> <a href="/chengxuyuan/" title="最新文章"> 最新文章 </a> <a href="/privacy/" title="用户隐私"> 用户隐私 </a> <a href="/copyright/" title="版权申明"> 版权申明 </a> </ul> </div> <div class="copyright"> 本站所有数据收集于网络,如果侵犯到您的权益，请联系网站进行下架处理。 </a> <span title="" class="email-box"></span> </p> </div> <div class="copyright"> <p> Copyright © 2018-2021 Powered By <a href="/" title="网页学习体会" target="_blank"> 网页学习体会 </a> 备案号： <a href="https://beian.miit.gov.cn/#/Integrated/index" target="_blank" rel="nofollow"> 粤ICP备20002247号 </a> </p> </div> </div> </div> </div> </footer> <div class="action" style="top:80%;"> <div class="a-box gotop" id="j-top" style="display: none;"></div> </div> <script type="text/javascript"> var _wpcom_js = {"ajaxurl":"","slide_speed":"5000"}; </script> <script type="text/javascript" src="/statics/wangyeyixia/js/main.js?v=1"></script> </body> </html>
