/**
* Add ids to headings tags based on their content
*
* @static
* @param string $html html string
* @param string $headingSelector CSS selector
* @return mixed modified
*/
public static function addHeadingsId($html, $headingSelector = 'h1, h2, h3, h4, h5, h6', $addLink = false)
{
if (!$html) {
return '';
}
$document = new \DOMDocument();
$document->loadHTML('<?xml encoding="UTF-8">' . $html);
$xpath = new \DOMXPath($document);
// Search heading tags
$ids = array();
foreach ($xpath->query(CssSelector::toXPath($headingSelector)) as $node) {
// If they don't have an id, find an unique one
if (!$node->hasAttribute('id')) {
$id = Inflector::urlize($node->textContent);
if (array_key_exists($id, $ids)) {
$ids[$id] += 1;
$id .= '-' . $ids[$id];
} else {
$ids[$id] = 1;
}
$node->setAttribute('id', $id);
}
if ($addLink) {
$link = $document->createElement('a', '#');
$link->setAttribute('href', '#' . $node->getAttribute('id'));
$link->setAttribute('class', 'anchor');
$node->appendChild($link);
}
}
// Remove \DomDocument's extra tags (doctype, html, body). Yeah, that's (a bit) ugly.
return preg_replace('#.*<html><body>(.*)</body></html>.*#is', '\\1', $document->saveHTML());
}
protected function getId($text)
{
return $this->fixId(Inflector::urlize($text));
}