function amp_frontend_add_canonical()
{
if (false === apply_filters('amp_frontend_show_canonical', true)) {
return;
}
$amp_url = amp_get_permalink(get_queried_object_id());
printf('<link rel="amphtml" href="%s" />', esc_url($amp_url));
}
function amp_admin_get_preview_permalink()
{
/**
* Filter the post type to retrieve the latest of for use in the AMP template customizer.
*
* @param string $post_type Post type slug. Default 'post'.
*/
$post_type = (string) apply_filters('amp_customizer_post_type', 'post');
if (!post_type_supports($post_type, 'amp')) {
return;
}
$post_ids = get_posts(array('post_status' => 'publish', 'post_type' => $post_type, 'posts_per_page' => 1, 'fields' => 'ids'));
if (empty($post_ids)) {
return false;
}
$post_id = $post_ids[0];
return amp_get_permalink($post_id);
}
/**
* Purge Post
* Flush the post
*
* @since 1.0
* @param array $postId the ID of the post to be purged
* @access public
*/
public function purgePost($postId)
{
// If this is a valid post we want to purge the post,
// the home page and any associated tags and categories
$validPostStatus = array("publish", "trash");
$thisPostStatus = get_post_status($postId);
// array to collect all our URLs
$listofurls = array();
if (get_permalink($postId) == true && in_array($thisPostStatus, $validPostStatus)) {
// If this is a post with a permalink AND it's published or trashed,
// we're going to add a ton of things to flush.
// Category purge based on Donnacha's work in WP Super Cache
$categories = get_the_category($postId);
if ($categories) {
foreach ($categories as $cat) {
array_push($listofurls, get_category_link($cat->term_id));
}
}
// Tag purge based on Donnacha's work in WP Super Cache
$tags = get_the_tags($postId);
if ($tags) {
foreach ($tags as $tag) {
array_push($listofurls, get_tag_link($tag->term_id));
}
}
// Author URL
array_push($listofurls, get_author_posts_url(get_post_field('post_author', $postId)), get_author_feed_link(get_post_field('post_author', $postId)));
// Archives and their feeds
$archiveurls = array();
if (get_post_type_archive_link(get_post_type($postId)) == true) {
array_push($listofurls, get_post_type_archive_link(get_post_type($postId)), get_post_type_archive_feed_link(get_post_type($postId)));
}
// Post URL
array_push($listofurls, get_permalink($postId));
// Also clean URL for trashed post.
if ($thisPostStatus == "trash") {
$trashpost = get_permalink($postId);
$trashpost = str_replace("__trashed", "", $trashpost);
array_push($listofurls, $trashpost, $trashpost . 'feed/');
}
// Add in AMP permalink if Automattic's AMP is installed
if (function_exists('amp_get_permalink')) {
array_push($listofurls, amp_get_permalink($postId));
}
// Regular AMP url for posts
array_push($listofurls, get_permalink($postId) . 'amp/');
// Feeds
array_push($listofurls, get_bloginfo_rss('rdf_url'), get_bloginfo_rss('rss_url'), get_bloginfo_rss('rss2_url'), get_bloginfo_rss('atom_url'), get_bloginfo_rss('comments_rss2_url'), get_post_comments_feed_link($postId));
// Home Page and (if used) posts page
array_push($listofurls, $this->the_home_url() . '/');
if (get_option('show_on_front') == 'page') {
// Ensure we have a page_for_posts setting to avoid empty URL
if (get_option('page_for_posts')) {
array_push($listofurls, get_permalink(get_option('page_for_posts')));
}
}
} else {
// We're not sure how we got here, but bail instead of processing anything else.
return;
}
// Now flush all the URLs we've collected provided the array isn't empty
if (!empty($listofurls)) {
foreach ($listofurls as $url) {
array_push($this->purgeUrls, $url);
}
}
// Filter to add or remove urls to the array of purged urls
// @param array $purgeUrls the urls (paths) to be purged
// @param int $postId the id of the new/edited post
$this->purgeUrls = apply_filters('vhp_purge_urls', $this->purgeUrls, $postId);
}
public function purge_post($postId)
{
// If this is a valid post we want to purge the post, the home page and any associated tags & cats
// If not, purge everything on the site.
$validPostStatus = array('publish', 'trash');
$thisPostStatus = get_post_status($postId);
// If this is a revision, stop.
if (get_permalink($postId) !== true && !in_array($thisPostStatus, $validPostStatus)) {
return;
} else {
// array to collect all our URLs
$listofurls = array();
// Category purge based on Donnacha's work in WP Super Cache
$categories = get_the_category($postId);
if ($categories) {
foreach ($categories as $cat) {
array_push($listofurls, get_category_link($cat->term_id));
}
}
// Tag purge based on Donnacha's work in WP Super Cache
$tags = get_the_tags($postId);
if ($tags) {
foreach ($tags as $tag) {
array_push($listofurls, get_tag_link($tag->term_id));
}
}
// Author URL
array_push($listofurls, get_author_posts_url(get_post_field('post_author', $postId)), get_author_feed_link(get_post_field('post_author', $postId)));
// Archives and their feeds
$archiveurls = array();
if (get_post_type_archive_link(get_post_type($postId)) == true) {
array_push($listofurls, get_post_type_archive_link(get_post_type($postId)), get_post_type_archive_feed_link(get_post_type($postId)));
}
// Post URL
array_push($listofurls, get_permalink($postId));
// Feeds
array_push($listofurls, get_bloginfo_rss('rdf_url'), get_bloginfo_rss('rss_url'), get_bloginfo_rss('rss2_url'), get_bloginfo_rss('atom_url'), get_bloginfo_rss('comments_rss2_url'), get_post_comments_feed_link($postId));
// Home Page and (if used) posts page
array_push($listofurls, home_url('/'));
if (get_option('show_on_front') == 'page') {
array_push($listofurls, get_permalink(get_option('page_for_posts')));
}
// If Automattic's AMP is installed, add AMP permalink
if (function_exists('amp_get_permalink')) {
array_push($listofurls, amp_get_permalink($postId));
}
// Now flush all the URLs we've collected
foreach ($listofurls as $url) {
array_push($this->purgeUrls, $url);
}
}
// Filter to add or remove urls to the array of purged urls
// @param array $purgeUrls the urls (paths) to be purged
// @param int $postId the id of the new/edited post
$this->purgeUrls = apply_filters('vcaching_purge_urls', $this->purgeUrls, $postId);
$this->purge_cache();
}
