Question

下面是一些包含在div标签内的随机不可预测的标签集。如何爆炸所有子标签innerHTML保留其出现的顺序。

注意：对于img，iframe标记只需要提取网址。

 <div>
  <p>para-1</p>
  <p>para-2</p>
  <p>
    text-before-image
    <img src="text-image-src"/>
    text-after-image</p>
  <p>
    <iframe src="p-iframe-url"></iframe>
  </p>
  <iframe src="iframe-url"></iframe>
  <h1>header-1</h1>
  <img src="image-url"/>
  <p>
    <img src="p-image-url"/>
  </p>
  content not wrapped within any tags
  <h2>header-2</h2>
  <p>para-3</p>
  <ul>
    <li>list-item-1</li>
    <li>list-item-2</li>
  </ul>
  <span>span-content</span>
 content not wrapped within any tags
</div>

预期数组：

 ["para-1","para-2","text-before-image","text-image-src","text-after-image",
"p-iframe-url","iframe-url","header-1","image-url",
"p-image-url","content not wrapped within any tags","header-2","para-3",
"list-item-1","list-item-2","span-content","content not wrapped within any tags"]

相关代码：

 $dom     = new DOMDocument();
        @$dom->loadHTML( $content );
        $tags = $dom->getElementsByTagName( 'p' );
        // Get all the paragraph tags, to iterate its nodes.
        $j = 0;
        foreach ( $tags as $tag ) {
            // get_inner_html() to preserve the node's text & tags
            $con[ $j ] = $this->get_inner_html( $tag );
            // Check if the Node has html content or not
            if ( $con[ $j ] != strip_tags( $con[ $j ] ) ) {      
                // Check if the node contains html along with plain text with out any tags
                if ( $tag->nodeValue != '' ) {
                    /*
                     * DOM to get the Image SRC of a node
                     */
                    $domM      = new DOMDocument();
                    /*
                     * Setting encoding type http://in1.php.net/domdocument.loadhtml#74777
                     * Set after initilizing DomDocument();
                     */
                    $con[ $j ] = mb_convert_encoding( $con[ $j ], 'HTML-ENTITIES', "UTF-8" );
                    @$domM->loadHTML( $con[ $j ] );
                    $y = new DOMXPath( $domM );
                    foreach ( $y->query( "//img" ) as $node ) {
                        $con[ $j ] = "img=" . $node->getAttribute( "src" );
                        // Increment the Array size to accomodate bad text and image tags.
                        $j++;
                        // Node incremented, fetch the node value and accomodate the text without any tags.
                        $con[ $j ] = $tag->nodeValue;
                    }
                    $domC      = new DOMDocument();
                    @$domC->loadHTML( $con[ $j ] );
                    $z = new DOMXPath( $domC );
                    foreach ( $z->query( "//iframe" ) as $node ) {
                        $con[ $j ] = "vid=http:" . $node->getAttribute( "src" );
                        // Increment the Array size to accomodate bad text and image tags.

                        $j++;
                        // Node incremented, fetch the node value and accomodate the text without any tags.
                        $con[ $j ] = $tag->nodeValue;
                    }
                } else {
                    /*
                     * DOM to get the Image SRC of a node
                     */
                    $domA      = new DOMDocument();
                    @$domA->loadHTML( $con[ $j ] );
                    $x = new DOMXPath( $domA );
                    foreach ( $x->query( "//img" ) as $node ) {
                        $con[ $j ] = "img=" . $node->getAttribute( "src" );
                    }

                    if ( $con[ $j ] != strip_tags( $con[ $j ] ) ) {
                        foreach ( $x->query( "//iframe" ) as $node ) {
                            $con[ $j ] = "vid=http:" . $node->getAttribute( "src" );
                        }
                    }
                }
            }
            // INcrement the node
            $j++;
        }

        $this->content = $con;

Answer 1

尝试递归方法！在类实例和函数$parts上获取一个空数组extractSomething(DOMNode $source)。你的功能应该是每个单独的情况，然后返回。如果来源是

TextNode：推送到$ parts
元素和名称= img：将其href推送到$ parts
其他特殊情况
元素：对于每个TextNode或Element子调用extractSomething（child）

现在，当对extractSomenting（yourRootDiv）的调用返回时，您将获得$ this-＆gt;部分中的列表。

请注意，您尚未定义<p> sometext1 <img href="ref" /> sometext2 <p>会发生什么，但上面的示例正在推动添加3个元素（＆＃34; sometext1＆＃34;，＆＃34; ref＆＃34;和＆＃34; sometext2＆＃34;）代表它。

这只是解决方案的大致轮廓。关键是你需要处理树中的每个节点（可能不是真正关于它的位置），并且在按照正确的顺序进行处理时，通过将每个节点转换为所需的文本来构建数组。递归是编码最快的，但您也可以尝试使用宽度遍历或walker工具。

底线是您必须完成两项任务：以正确的顺序遍历节点，将每个节点转换为所需的结果。

这基本上是处理树/图结构的经验法则。

Answer 2

从DOM文档中提取有趣信息的快速简便方法是使用XPath。下面是一个基本示例，演示如何从div元素中获取文本内容和属性文本。

<?php

// Pre-amble, scroll down to interesting stuff...
$html = '<div>
  <p>para-1</p>
  <p>para-2</p>
  <p>
    <iframe src="p-iframe-url"></iframe>
  </p>
  <iframe src="iframe-url"></iframe>
  <h1>header-1</h1>
  <img src="image-url"/>
  <p>
    <img src="p-image-url"/>
  </p>
  content not wrapped within any tags
  <h2>header-2</h2>
  <p>para-3</p>
  <ul>
    <li>list-item-1</li>
    <li>list-item-2</li>
  </ul>
  <span>span-content</span>
 content not wrapped within any tags
</div>';

$doc = new DOMDocument;
$doc->loadHTML($html);
$div = $doc->getElementsByTagName('div')->item(0);

// Interesting stuff:

// Use XPath to get all text nodes and attribute text
// $tests becomes a DOMNodeList filled with DOMText and DOMAttr objects
$xpath = new DOMXPath($doc);
$texts = $xpath->query('descendant-or-self::*/text()|descendant::*/@*', $div);

// You could only include/exclude specific attributes by looking at their name
// e.g. multiple paths: .//@src|.//@href
// or whitelist:        descendant::*/@*[name()="src" or name()="href"]
// or blacklist:        descendant::*/@*[not(name()="ignore")]

// Build an array of the text held by the DOMText and DOMAttr objects
// skipping any boring whitespace
$results = array();
foreach ($texts as $text) {
    $trimmed_text = trim($text->nodeValue);
    if ($trimmed_text !== '') {
        $results[] = $trimmed_text;
    }
}

// Let's see what we have
var_dump($results);

Answer 3

最简单的方法是使用DOMDocument： http://www.php.net/manual/en/domdocument.loadhtmlfile.php

在数组中分解随机的unpredictagle标记

3 个答案: