PHP-如何用另一个替换短语？

Question

How can i replace this <p><span class="headline"> with this <p class="headline"><span> easiest with PHP.

$data = file_get_contents("http://www.ihr-apotheker.de/cs1.html");
$clean1 = strstr($data, '<p>');
$str = preg_replace('#(<a.*>).*?(</a>)#', '$1$2', $clean1);
$ausgabe = strip_tags($str, '<p>');
echo $ausgabe;

Before I alter the html from the site I want to get the class declaration from the span to the <p> tag.

Answer 1

dont parse html with regex! this class should provide what you need http://simplehtmldom.sourceforge.net/

Answer 2

The reason not to parse HTML with regex is if you can't guarantee the format . If you already know the format of the string, you don't have to worry about having a complete parser.

In your case, if you know that's the format, you can use str_replace

str_replace('<p><span class="headline">', '<p class="headline"><span>', $data);

Answer 3

Well, answer was accepted already, but anyway, here is how to do it with native DOM:

$dom = new DOMDocument;
$dom->loadHTMLFile("http://www.ihr-apotheker.de/cs1.html");
$xPath = new DOMXpath($dom);

// remove links but keep link text
foreach($xPath->query('//a') as $link) {
    $link->parentNode->replaceChild(
        $dom->createTextNode($link->nodeValue), $link);
}

// switch classes    
foreach($xPath->query('//p/span[@class="headline"]') as $node) {
    $node->removeAttribute('class');
    $node->parentNode->setAttribute('class', 'headline');
}
echo $dom->saveHTML();

On a sidenote, HTML has elements for headings, so why not use a <h*> element instead of using the semantically superfluous "headline" class.

Answer 4

Have you tried using str_replace ?

If the placement of the <p> and <span> tags are consistent, you can simply replace one for the other with

str_replace("replacement", "part to replace", $string);