Find H2 tag in a string and give it a ID_问答_开发者

Find H2 tag in a string and give it a ID

开发者 https://www.devze.com 2023-02-10 22:04 出处：网络

Searching stackoverflow i\'ve found a answer for my need, but I can\'t figure out how to use it exactly if someone could give me a hint It would be appreciated !

Searching stackoverflow i've found a answer for my need, but I can't figure out how to use it exactly if someone could give me a hint It would be appreciated !

Here's my need, I'm using word开发者_开发技巧press and I would to put automatic ID to <...> tags so I found "mario" who answer this:

If you have a coherent input like that, then you can use regular expressions. In this case it's both very acceptable and simple:
$html = preg_replace_callback("#<(h[1-6])>(.*?)</\\1>#", "retitle", $html);

function retitle($match) {
    list($_unused, $h2, $title) = $match;

    $id = strtolower(strtr($title, " .", "--"));

    return "<$h2 id='$id'>$title</$h2>"; }
The id conversion needs a bit more work. And to make the regex more reliable the innter text match pattern (.*?) could be written as ([^<>]*) for example.

H2 tag auto ID in php string

So i've tryed to apply this to my script, but that doesn't work well at all, here is my code

<?php 
        $html = get_the_content();
        $html = preg_replace_callback("#<(h[1-6])>(.*?)</\\1>#", "retitle", $html);
        
        function retitle($match) {
            list($_unused, $h2, $title) = $match;
            $id = strtolower(strtr($title, " .", "--"));
            return "<$h2 id='$id'>$title</$h2>";
        }
    
        if(have_posts()) : while(have_posts()) : the_post(); //Vérifie que le contenu existe 
                echo $html;
            endwhile; 
        endif;
    ?>

Don't use regex to solve that problem. Using domdocument:

if (empty($content)) return '';
$dom = new DomDocument();
libxml_use_internal_errors(true)
$html = '<html>
           <head>
             <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
           </head>
           <body>'.$content.'</body>
         </html>';
$dom->loadHtml($html);
$hTAGs = $dom->getElementsByTagName($tag);
foreach ($hTAGs as $hTAG) {
    if (!$hTAG->hasAttribute('id')) {
        $title = $hTAG->nodeValue;
        $id = iconv('UTF-8', 'ASCII//TRANSLIT', $title);
        $id = preg_replace('/[^a-zA-Z0-9-\s]/', '', $id);
        $hTAG->setAttribute('id', $id);
    }
}
$content = '';
$children = $dom->getElementsByTagName('body')->item(0)->childNodes;
foreach ($children as $child) {
    $content .= $dom->saveXml($child);
}
return $content;

Never, ever use RegEx for HTML, ok? Just accept this. Or read the numerous posts on here why not.

DOMDocument is ugly and evil. Use simple_html_dom instead, it's much simpler:

include 'simple_html_dom.php';

$html = str_get_html('<h2>hello</h2><h3>world</h3><h2 id='123'>how r ya</h2>');

$h2s = $html->find("h2");

foreach($h2s as $h2)
{
    if(!$h2->hasAttribute("id")) $h2->id = "title";
}

echo $html->save();