Question

我有一个脚本，它读取XML标签并将其打印在我的页面上。有些项目是链接（没有HTML标签），所以我创建了一个向其添加HTML链接标签的功能。但是，链接呈现为字符串而不是HTML。

我知道它因为我使用了createTextNode，所以我需要一些东西将它作为一个对象返回而不是一个字符串。

继承我的代码

function get_feeds() {
    $feeds = array(
        array(
            'name' => 'Agenda',
            'url' => 'http://www.beleefdokkum.nl//pages/rss.aspx?type=agenda',
            'get' => array('title', 'description', 'link'),
            'scope' => array(1, 10)
        ),
        array(
            'name' => 'News',
            'url' => 'http://www.beleefdokkum.nl//pages/rss.aspx?type=nieuws',
            'get' => array('title', 'description', 'link'),
            'scope' => array(1, 10)
        ),
        array(
            'name' => 'Social media',
            'url' => 'http://api.twitter.com/1/statuses/user_timeline.rss?screen_name=NOFriesland',
            'get' => array('description'),
            'scope' => array(1, 10)
        )
    );

    $result = new DOMDocument();

    function linkify($text) {
        $text = preg_replace('/(https?:\/\/\S+)/', '<a href="\1" class="preg-links">\1</a>', $text);
        $text = preg_replace('/(^|\s)@(\w+)/', '\1@<a href="http://twitter.com/\2" class="preg-links">\2</a>', $text);
        $text = preg_replace('/(^|\s)#(\w+)/', '\1#<a href="http://search.twitter.com/search?q=%23\2" class="preg-links">\2</a>', $text);
        return $text;
    }

    foreach ($feeds as $feed) {
        $xml = new DOMDocument();
        $xml->load($feed['url']);
        $frame = $result->createElement('div');
        $frame->setAttribute('class', 'feed_frame');
        $result->appendChild($frame);
        $name = $result->createElement('h1', $feed['name']);
        $name->setAttribute('class', 'feed_name');
        $frame->appendChild($name);
        $content = $result->createElement('div');
        $content->setAttribute('class', 'feed_content');
        $frame->appendChild($content);
        for ($i = $feed['scope'][0]; $i < $feed['scope'][1]; $i++) {
            $item = $result->createElement('span');
            $item->setAttribute('class', 'feed_item');
            $content->appendChild($item);
            foreach ($feed['get'] as $get) {
                $object = $result->createElement('p');
                $text = $result->createTextNode(linkify($xml->getElementsByTagName($get)->item($i)->nodeValue));
                $object->appendChild($text);
                $object->setAttribute('class', 'feed_'.$get);
                $item->appendChild($object);
            }
        }
    }
    return $result->saveHTML();
}

Answer 1

可能还有其他方法，但我会在您执行正则表达式匹配时通过创建文本节点和锚点来解决它：

$node = $dom->createElement('p');
linkify($doc, $node, 'T1 @test T2 #test T3 http://www.stackoverflow.com T4');

linkify()函数接受现有节点，并根据给定的字符串创建文本节点和锚点。

function linkify($dom, $node, $text)
{
    // we combine all possible patterns in one expression
    $re = '/(https?:\/\/\S+)|(?:^|\s)@(\w+)|(?:^|\s)#(\w+)/';
    // we capture pattern offsets
    $flags = PREG_SET_ORDER | PREG_OFFSET_CAPTURE;

    $offset = 0;
    if (preg_match_all($re, $text, $matches, $flags)) {
        foreach ($matches as $match) {
            // set start and end markers of the matched pattern
            $start = $match[0][1];
            $end = $match[0][1] + strlen($match[0][0]);
            // process each pattern based on the resulting matches
            if (isset($match[3])) { // Twitter hash
                $start += 2; // skip space and #
                $url = 'http://search.twitter.com/search?q=' . 
                    urlencode("#{$match[3][0]}");
                $anchor = anchor($dom, $url, $match[3][0]);
            } elseif (isset($match[2])) { // Twitter user
                $start += 2;
                $url = 'http://twitter.com/' . urlencode($match[2][0]);
                $anchor = anchor($dom, $url, $match[2][0]);
            } else { // standard url
                $anchor = anchor($dom, $match[1][0], $match[1][0]);
            }

            if ($start > $offset) {
                // we have text in between previous match (or start) and here
                $str = substr($text, $offset, $start - $offset);
                $node->appendChild($dom->createTextNode($str));
            }
            // insert the new anchor
            $node->appendChild($anchor);
            // keep track of last match marker
            $offset = $end;
        }
        // add last text node
        $node->appendChild($dom->createTextNode(substr($text, $offset)));
    }
}

当您运行->saveHTML()：

时，这将是输出

<p>
  T1 
   @<a href="http://twitter.com/datibbaW" class="preg-links">datibbaW</a> 
  T2
   #<a href="http://search.twitter.com/search?q=%23test" class="preg-links">test</a>
  T3 
   <a href="http://www.stackoverflow.com" class="preg-links">http://www.stackoverflow.com</a>
   T4</p>

我正在使用便利功能来创建锚点：

function anchor($dom, $url, $text)
{
    $anchor = $dom->createElement('a', $text);
    $anchor->setAttribute('href', $url);
    $anchor->setAttribute('class', 'preg-links');

    return $anchor;
}

PHP：createTextNode作为对象

1 个答案: