Count html links in a string and add a list

Question

Hi.

I store the content of a website in a string $html.

I want to count all html links that link to a file in the .otf format, add a list of these links to the end of $html and remove the original links.

An example:

<?php
$html_input = '
<p>
    Lorem <a href="font-1.otf">ipsum</a> dolor sit amet, 
    consectetur <a href="http://www.cnn.com"&gt;adipiscing&lt;/a&gt; elit.
    Quisque <a href="font-2.otf">ultricies</a> placerat massa 
    vel dictum.
</p>'

// some magic here    

$html_output = '
<p>
    Lorem ipsum dolor sit amet, 
    consectetur <a href="http://www.cnn.com"&gt;adipiscing&lt;/a&gt; elit.
    Quisque ultricies placerat massa 
    vel dictum.
</p>
<p>.otf-links: 2</p>
<ul>
    <li><a href="font-1.otf">ipsum</a></li>
    <li><a href="font-2.otf">ultricies</a></li>
</ul>'
?>        

How do I do that? Should I use regular expressions, or is there another way?

Answer 1

Use a DOM Parser

Example:

$h = str_get_html($html);

$linkCount = count($h->find('a'));

foreach ( $h->find('a') as $a ){
    //print every link ending in .odf
    if ( ends_with(strtolower($a->href), '.odf') ){ //ends with isn't a function, but it is trivial to write

        echo '<li><a href="'.$a->href.'">'.$a->innertext.'</a></li>';
    }
}

Answer 2

preg_match('~<a href="[^"]+\.otf">.*?</a>~s', $html_input, $matches);
$linksCount = count($matches[0]);
preg_replace('~<a href="[^"]+\.otf">.*?</a>~s', '', $html_input);
$html_input.='<ul><li>'.implode('</li><li>', $matches[0]).'</li></ul>';

Answer 3

require_once("simple_html_dom.php");

$doc = new simple_html_dom();
$doc->load($input_html);

$fonts = array();
$links = $doc->find("a");

foreach ( $links as $l ) {
    if ( substr($l->href, -4) == ".otf" ) {
        $fonts[]      = $l->outertext;
        $l->outertext = $l->innertext;
    }
}

$output = $doc->save() . "\n<p>.otf-links: " . count($fonts) ."</p>\n" .
    "<ul>\n\t<li>" . implode("</li>\n\t<li>", $fonts) . "</li>\n</ul>";

Documenation for Simple HTML DOM http://simplehtmldom.sourceforge.net/