SimplePie::get_categories() │ public │ WP 1.0

Get all categories for the feed

Uses <atom:category>, <category> or <dc:subject>

{} It's a method of the class: SimplePie{}

No Hooks.

Return

Array|null. List of SimplePie_Category{} objects

Usage

$SimplePie = new SimplePie();
$SimplePie->get_categories();

Changelog

Since Unknown

Code of SimplePie::get_categories() WP 6.0

wp-includes/class-simplepie.php 
public function get_categories()
{
	$categories = array();

	foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_ATOM_10, 'category') as $category)
	{
		$term = null;
		$scheme = null;
		$label = null;
		if (isset($category['attribs']['']['term']))
		{
			$term = $this->sanitize($category['attribs']['']['term'], SIMPLEPIE_CONSTRUCT_TEXT);
		}
		if (isset($category['attribs']['']['scheme']))
		{
			$scheme = $this->sanitize($category['attribs']['']['scheme'], SIMPLEPIE_CONSTRUCT_TEXT);
		}
		if (isset($category['attribs']['']['label']))
		{
			$label = $this->sanitize($category['attribs']['']['label'], SIMPLEPIE_CONSTRUCT_TEXT);
		}
		$categories[] = $this->registry->create('Category', array($term, $scheme, $label));
	}
	foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_RSS_20, 'category') as $category)
	{
		// This is really the label, but keep this as the term also for BC.
		// Label will also work on retrieving because that falls back to term.
		$term = $this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT);
		if (isset($category['attribs']['']['domain']))
		{
			$scheme = $this->sanitize($category['attribs']['']['domain'], SIMPLEPIE_CONSTRUCT_TEXT);
		}
		else
		{
			$scheme = null;
		}
		$categories[] = $this->registry->create('Category', array($term, $scheme, null));
	}
	foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_11, 'subject') as $category)
	{
		$categories[] = $this->registry->create('Category', array($this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
	}
	foreach ((array) $this->get_channel_tags(SIMPLEPIE_NAMESPACE_DC_10, 'subject') as $category)
	{
		$categories[] = $this->registry->create('Category', array($this->sanitize($category['data'], SIMPLEPIE_CONSTRUCT_TEXT), null, null));
	}

	if (!empty($categories))
	{
		return array_unique($categories);
	}

	return null;
}