从页面中提取<p>标记并使用php绕过<div>

Question

我有一个基于php的动态网站与FAQ页面。我想为SEO的目的自动将微数据注入到文本中。我已经看到了获得html的代码，并将微数据自动注入到html中，并使用微数据输出html，但不知怎么的，没有得到预期的结果。

我尝试了下面的php代码：

<?php
$faq = "
<h3>What does the story's title mean?</h3>
<p>The beating of a heart which causes the narrator to go insane that he confesses to his crimes. So the title means he's telling (Tell) the story of the old man's beating heart (Tale Heart) that drove him insane.</p>
<h3>The narrator claims he is not mad. What evidence do we have that he is?</h3>
<p>The narrator's desire to eradicate the man's eye motivates his murder, but the narrator does not acknowledge that this act will end the man's life. By dismembering his victim, the narrator further deprives the old man of his humanity.</p>";

$dom = new DOMDocument();
$dom->loadHTML($faq);
$title = $dom->getElementsByTagName('h3');
$paras = $dom->getElementsByTagName('p');
foreach($title as $h){
    $h->setAttribute('class', 'faqy');
    $h->setAttribute('itemprop', 'name');
  }

foreach($paras as $p){
    $acceptedAnswer = $dom->createElement('div');
    $acceptedAnswer->setAttribute('itemscope','');
    $acceptedAnswer->setAttribute('itemprop','acceptedAnswer');
    $acceptedAnswer->setAttribute('itemtype','https://schema.org/Answer');
    foreach ($p->childNodes as $child) {
        $p->removeChild($child);
        $acceptedAnswer->appendChild($child);
    }
    $p->appendChild($acceptedAnswer);        
    $p->setAttribute('class', 'faqp');
    $p->setAttribute('itemprop', 'text');
    $p->setAttribute('style', 'display: none;');
 }
$html=$dom->saveHTML();

function wrapcallback( $buffer ){
        global $use_output_buffer;
        $delimiter='#';
        $tags=array('h1','h2','h3','h4','h5','h6');
        $query=implode('|', explode( $delimiter, sprintf( '//%s', implode( sprintf( '%s//', $delimiter ), $tags ) ) ) );
        $keepers=array();
        $parents=array();
        libxml_use_internal_errors( true );
        $dom=new DOMDocument;
        $dom->validateOnParse=false;
        $dom->recover=true;
        $dom->strictErrorChecking=false;
        $dom->preserveWhiteSpace=true;
        $dom->loadHTML( $buffer );
        $errors = libxml_get_errors();
        libxml_clear_errors();
        $xp=new DOMXPath( $dom );
        $col=$xp->query( $query );
        if( $col->length > 0 ){
            foreach( $col as $node ){
                $parents[]=$node->parentNode;
                $nodes=array( $node );
                while( $node = $node->nextSibling ){
                    if( in_array( $node->nodeName, $tags ) )break;
                    if( $node->nodeType==XML_ELEMENT_NODE  )$nodes[]=$node;
                }
                $keepers[]=$nodes;
            }
        }
        foreach( $keepers as $index => $obj ){
            $mainEntity=$dom->createElement('li');
            $mainEntity->setAttribute('class', 'faqq');
            $mainEntity->setAttribute('itemscope', '');
            $mainEntity->setAttribute('itemprop', 'mainEntity');
            $mainEntity->setAttribute('itemtype', 'https://schema.org/Question');
            $parents[ $index ]->appendChild( $mainEntity );
            foreach( $obj as $child )$mainEntity->appendChild( $child );
        }
        $keepers = $parents = $xp = $mainEntity = null;
        echo $dom->saveHTML();
    };
    $wraptext=$html;
?>
<div class="dfaq cfix" itemscope itemtype="https://schema.org/FAQPage">
<h2 class="faqt">FAQs</h2>
<ul class="faqs">
<?php wrapcallback($wraptext); ?>
</ul>
</div><!-- /.dfaq -->

上面php的html输出是

<div class="dfaq cfix" itemscope="" itemtype="https://schema.org/FAQPage">
    <h2 class="faqt">FAQs</h2>
    <ul class="faqs">
        <li class="faqq" itemscope="" itemprop="mainEntity" itemtype="https://schema.org/Question">
            <h3 class="faqy" itemprop="name">What does the story's title mean?</h3>
            <p class="faqp" itemprop="text" style="display: none;"></p>
            <div itemscope="" itemprop="acceptedAnswer" itemtype="https://schema.org/Answer">
                The beating of a heart which causes the narrator to go insane that he confesses to his crimes. So the title means he's telling (Tell) the story of the old man's beating heart (Tale Heart) that drove him insane.
            </div>
        </li>
        <li class="faqq" itemscope="" itemprop="mainEntity" itemtype="https://schema.org/Question">
            <h3 class="faqy" itemprop="name">The narrator claims he is not mad. What evidence do we have that he is?</h3>
            <p class="faqp" itemprop="text" style="display: none;"></p>
            <div itemscope="" itemprop="acceptedAnswer" itemtype="https://schema.org/Answer">
                The narrator's desire to eradicate the man's eye motivates his murder, but the narrator does not acknowledge that this act will end the man's life. By dismembering his victim, the narrator further deprives the old man of his
                humanity.
            </div>
        </li>
    </ul>
</div>

预期的html输出/我需要这个html输出：

<div class="dfaq cfix" itemscope="" itemtype="https://schema.org/FAQPage">
    <h2 class="faqt">FAQs</h2>
    <ul class="faqs">
        <li class="faqq" itemscope="" itemprop="mainEntity" itemtype="https://schema.org/Question">
            <h3 class="faqy" itemprop="name">What does the story's title mean?</h3>
            
            <div itemscope="" itemprop="acceptedAnswer" itemtype="https://schema.org/Answer">
                <p class="faqp" itemprop="text" style="display: none;">The beating of a heart which causes the narrator to go insane that he confesses to his crimes. So the title means he's telling (Tell) the story of the old man's beating heart (Tale Heart) that drove him insane.</p>
            </div>
        </li>
        <li class="faqq" itemscope="" itemprop="mainEntity" itemtype="https://schema.org/Question">
            <h3 class="faqy" itemprop="name">The narrator claims he is not mad. What evidence do we have that he is?</h3>
            <p class="faqp" itemprop="text" style="display: none;"></p>
            <div itemscope="" itemprop="acceptedAnswer" itemtype="https://schema.org/Answer">
                <p class="faqp" itemprop="text" style="display: none;">The narrator's desire to eradicate the man's eye motivates his murder, but the narrator does not acknowledge that this act will end the man's life. By dismembering his victim, the narrator further deprives the old man of his humanity.</p>
            </div>
        </li>
    </ul>
</div>

Answer 1

在元素之前创建div 。当您重新追加一个节点时，它将被移动。

$html = '<p>text</p>';

$doc = new DOMDocument();
$doc->loadHTML($html);

$div = $doc->createElement('div');
$div->setAttribute('class', 'wrapper');

// Get the element
$p = $doc->getElementsByTagName('p')->item(0);

// Insert the new one before
$divNode = $p->parentNode->insertBefore($div, $p);

// Move the p into div
$divNode->appendChild($p);

echo $doc->saveHTML();

输出

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/REC-html40/loose.dtd">
<html><body><div class="wrapper"><p>text</p></div></body></html>