/**
* Filter Yoast post metadata.
*
* When Yoast builds HTML title and meta description, it looks in tree places:
* - Actual post_title,
* - Title and Description from Yoast Snippet (fancy metabox for each post),
* - Rules (%%title%% %%sep%% %%page%%) in the SEO Settings.
* Yoast gets confused when not all languages are filled in consistently
* (one language has post_title, another one - only Snippet, others - should work
* from the Rules).
* We are trying to hook into the `get_post_metadata` and return filtered values
* to Yoast, so when it should be empty - it's empty and not
* {:xx}Something from another language{:}
*
* @scope front
* @since 1.4.0 (original)
* 1.5.5 (restored and rewritten)
*
* @param null|array $metadata Comes as NULL. Return something to short-circuit.
* @param int $post_id Post ID.
* @param string $meta_key Empty because the array of all metas is returned.
* @param bool $single False in this case.
*
* @return null|array Return metadata array if we are "in business".
*/
public static function filter__get_post_metadata($metadata, $post_id, $meta_key, $single)
{
// Yoast does not pass any `meta_key`, and does not ask for `single`.
// Checking it here is faster than going to backtrace directly.
if ($meta_key || $single) {
return $metadata;
}
// We only need to deal with these two callers:
if (WPGlobus_WP::is_functions_in_backtrace(array(array('WPSEO_Frontend', 'get_content_title'), array('WPSEO_Frontend', 'generate_metadesc')))) {
/**
* The part of getting meta / updating cache is copied from
* @see get_metadata
* (except for doing serialize - we believe it's not necessary for Yoast).
*/
/** @var array $post_meta */
$post_meta = wp_cache_get($post_id, 'post_meta');
if (!$post_meta) {
$meta_cache = update_meta_cache('post', array($post_id));
$post_meta = $meta_cache[$post_id];
}
/**
* Filter both title and meta description to the current language.
*
* @important Return empty if no current language text exists,
* do not use the default. Yoast must receive empty string to realize
* that meta is not set for that language.
*/
foreach (array('_yoast_wpseo_title', '_yoast_wpseo_metadesc') as $_) {
if (!empty($post_meta[$_][0])) {
$post_meta[$_][0] = WPGlobus_Core::text_filter($post_meta[$_][0], WPGlobus::Config()->language, WPGlobus::RETURN_EMPTY);
}
}
// ... and return it.
$metadata = $post_meta;
}
return $metadata;
}
