/**
* Filter function that generates and embeds Schema.org metadata in the content.
*/
function amt_add_schemaorg_metadata_content_filter($post_body)
{
if (apply_filters('amt_exclude_schemaorg_metadata', false)) {
return $post_body;
}
// For AMT timings
$t = microtime(true);
// Get the options the DB
$options = get_option("add_meta_tags_opts");
// Get current post object
$post = amt_get_queried_object();
// Caching indicator
$is_cached = 'no';
// First, try to get cached metadata. Cache must be cleared if settings have changed.
if (absint($options['transient_cache_expiration']) > 0 && apply_filters('amt_enable_metadata_cache_in_content_filter', true)) {
$cached_content_metadata_arr = amt_get_transient_cache($post, $options, $where = 'content');
if (!empty($cached_content_metadata_arr)) {
$is_cached = 'yes';
// For AMT timings
if ($options['enable_timings'] == '1') {
array_unshift($cached_content_metadata_arr, sprintf('<!-- Add-Meta-Tags Timings (milliseconds) - Block total time: %.3f msec - Cached: %s -->', (microtime(true) - $t) * 1000, $is_cached));
}
// Add our comment
if ($options["omit_vendor_html_comments"] == "0") {
array_unshift($cached_content_metadata_arr, "<!-- BEGIN Schema.org microdata added by the Add-Meta-Tags WordPress plugin -->");
}
array_unshift($cached_content_metadata_arr, "");
// Intentionaly left empty
if ($options["omit_vendor_html_comments"] == "0") {
array_push($cached_content_metadata_arr, "<!-- END Schema.org microdata added by the Add-Meta-Tags WordPress plugin -->");
}
array_push($cached_content_metadata_arr, "");
// Intentionaly left empty
//
// Non persistent cache for metadata review mode.
//
// The review mode's content filter should have bigger priority than this
// filter (be executed after this one). This one by default has priority 9999
// while the review mode filter has priority of 10000
if (amt_check_run_metadata_review_code($options)) {
// What happens here is this: we copy the metadata array and remove the
// item that contains the content data, because it is not needed for
// metadata review.
// Then use non-persistent cache to store this new array.
// Metadata Review mode's filtering function should be attached with a
// priority bigger than this one, so that it is executed after this one.
// There the data is loaded from the non-persistent cache.
// This way, the timings are the same as in the source code and also
// it is more efficient from a resources perspective.
// WARNING: in order to work fine, set correct filter priorities.
$metadata_arr_for_review = $cached_content_metadata_arr;
if (array_key_exists('content_data', $metadata_arr_for_review)) {
$metadata_arr_for_review['content_data'] = ' <!-- The content has been removed from the metadata review. -->';
}
wp_cache_add('amt_cache_metadata_block_content_filter', $metadata_arr_for_review, $group = 'add-meta-tags');
unset($metadata_arr_for_review);
}
// Return cached metadata (contains the post body)
return implode(PHP_EOL, $cached_content_metadata_arr);
}
}
$do_auto_schemaorg = $options["auto_schemaorg"] == "1" ? true : false;
if (!$do_auto_schemaorg) {
return $post_body;
}
// Check if the microdata or the JSON-LD schema.org generator should be used.
if ($options["schemaorg_force_jsonld"] == "1") {
return $post_body;
}
// Check for AMP page https://www.ampproject.org/
// For AMP pages we do not generate Schema.org microdata around the post content,
// but enforce the JSON+LD form.
if ($do_auto_schemaorg && function_exists('is_amp_endpoint') && is_amp_endpoint()) {
return $post_body;
}
if (is_feed()) {
return $post_body;
}
if (!is_singular() || is_front_page()) {
// is_front_page() is used for the case in which a static page is used as the front page.
// In this filter function we only deal with content and attachments.
return $post_body;
}
// Additional check to make sure we have a post.
if ($post->ID == 0) {
// Can happen with some BuddyPress pages (eg member page)
return $post_body;
}
$metadata_arr = array();
// Since this is a function that is hooked to the 'the_content' filter
// of WordPress, the post type check has not run, so this happens here.
// Check if metadata is supported on this content type.
$post_type = get_post_type($post);
if (!in_array($post_type, amt_get_supported_post_types())) {
return $post_body;
}
// Get an array containing the attachments
$attachments = amt_get_ordered_attachments($post);
//var_dump($attachments);
// Get an array containing the URLs of the embedded media
$embedded_media = amt_get_embedded_media($post);
//var_dump($embedded_media);
// Custom content override
if (amt_is_custom($post, $options)) {
// Return metadata with:
// add_filter( 'amt_custom_metadata_schemaorg_content_filter', 'my_function', 10, 5 );
// Return an array of meta tags. Array item format: ['key_can_be_whatever'] = '<meta name="foo" content="bar" />'
$metadata_arr = apply_filters('amt_custom_metadata_schemaorg_content_filter', $metadata_arr, $post, $options, $attachments, $embedded_media);
// Products
} elseif (amt_is_product()) {
// Scope BEGIN: Product: http://schema.org/Product
$metadata_arr[] = '<!-- Scope BEGIN: Product -->';
$metadata_arr[] = '<div itemscope itemtype="http://schema.org/Product"' . amt_get_schemaorg_entity_id_as_itemid('product') . amt_get_schemaorg_itemref('product') . '>';
// URL - Uses amt_get_permalink_for_multipage()
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(amt_get_permalink_for_multipage($post)) . '" />';
// mainEntityOfPage
$metadata_arr[] = '<meta itemprop="mainEntityOfPage" content="' . esc_url(amt_get_permalink_for_multipage($post)) . '" />';
// name
// Note: Contains multipage information through amt_process_paged()
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr(amt_process_paged(strip_tags(get_the_title($post->ID)))) . '" />';
// headline - contains title information
//$metadata_arr['microdata:headline'] = '<meta itemprop="headline" content="' . esc_attr( amt_get_title_for_metadata($options, $post) ) . '" />';
// Description - We use the description defined by Add-Meta-Tags
// Note: Contains multipage information through amt_process_paged()
$content_desc = amt_get_content_description($post);
//if ( empty($content_desc) ) {
// // Use the post body as the description. Product objects do not support body text.
// $content_desc = sanitize_text_field( amt_sanitize_description( $post_body ) );
//}
if (!empty($content_desc)) {
$metadata_arr[] = '<meta itemprop="description" content="' . esc_attr(amt_process_paged($content_desc)) . '" />';
}
// Dates
$metadata_arr[] = '<meta itemprop="releaseDate" content="' . esc_attr(amt_iso8601_date($post->post_date)) . '" />';
// Images
// First check if a global image override URL has been entered.
// If yes, use this image URL and override all other images.
$image_data = amt_get_image_data(amt_get_post_meta_image_url($post->ID));
if (!empty($image_data)) {
$image_size = apply_filters('amt_image_size_product', 'full');
$image_meta_tags = amt_get_schemaorg_image_metatags($options, $image_data, $size = $image_size);
if (!empty($image_meta_tags)) {
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
$metadata_arr = array_merge($metadata_arr, $image_meta_tags);
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
//$global_image_override_url = amt_get_post_meta_image_url($post->ID);
//if ( ! empty( $global_image_override_url ) ) {
// $metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
// $metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// $metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( $global_image_override_url ) . '" />';
// $metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw( $global_image_override_url ) . '" />';
// $metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Further image processing
} else {
// Set to true if any image attachments are found. Use to finally add the default image
// if no image attachments have been found.
$has_images = false;
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
// Image - Featured image is checked first, so that it can be the first associated image.
if (function_exists('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
// Get the image attachment object
$image = get_post(get_post_thumbnail_id($post->ID));
// metadata BEGIN
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// Allow filtering of the image size.
$image_size = apply_filters('amt_image_size_product', 'full');
// Get image metatags.
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_image_metatags($options, $image, $size = $image_size));
// metadata END
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Images have been found.
$has_images = true;
}
// Scope END: ImageObject
// If no images have been found so far use the default image, if set.
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
if ($has_images === false) {
$image_data = amt_get_default_image_data();
if (!empty($image_data)) {
$image_size = apply_filters('amt_image_size_product', 'full');
$image_meta_tags = amt_get_schemaorg_image_metatags($options, $image_data, $size = $image_size);
if (!empty($image_meta_tags)) {
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
$metadata_arr = array_merge($metadata_arr, $image_meta_tags);
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
}
//$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
//$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( $options["default_image_url"] ) . '" />';
//$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw( $options["default_image_url"] ) . '" />';
//$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
// Scope END: ImageObject
}
// Extend the current metadata with properties of the Product object.
// See: http://schema.org/Product
$metadata_arr = apply_filters('amt_product_data_schemaorg', $metadata_arr, $post);
// Scope END: Product
$metadata_arr[] = '</div> <!-- Scope END: Product -->';
// Filtering of the generated Schema.org metadata
$metadata_arr = apply_filters('amt_schemaorg_metadata_product', $metadata_arr);
// Add post body
// Remove last closing '</div>' tag, add post body and re-add the closing div afterwards.
$closing_product_tag = array_pop($metadata_arr);
// Product objects do not support a 'text' itemprop. We just add a div for now
// for consistency with Article objects.
// TODO: it should allow filtering '<div>'
$metadata_arr[] = '<div> <!-- Product text body: BEGIN -->';
$metadata_arr['content_data'] = $post_body;
$metadata_arr[] = '</div> <!-- Product text body: END -->';
// Now add closing tag for Article
$metadata_arr[] = $closing_product_tag;
// Attachemnts
} elseif (is_attachment()) {
$mime_type = get_post_mime_type($post->ID);
//$attachment_type = strstr( $mime_type, '/', true );
// See why we do not use strstr(): http://www.codetrax.org/issues/1091
$attachment_type = preg_replace('#\\/[^\\/]*$#', '', $mime_type);
// Early metatags - Scope starts
if ('image' == $attachment_type) {
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<div itemscope itemtype="http://schema.org/ImageObject"' . amt_get_schemaorg_itemref('attachment_image') . '>';
} elseif ('video' == $attachment_type) {
// Scope BEGIN: VideoObject: http://schema.org/VideoObject
$metadata_arr[] = '<!-- Scope BEGIN: VideoObject -->';
$metadata_arr[] = '<div itemscope itemtype="http://schema.org/VideoObject"' . amt_get_schemaorg_itemref('attachment_video') . '>';
} elseif ('audio' == $attachment_type) {
// Scope BEGIN: AudioObject: http://schema.org/AudioObject
$metadata_arr[] = '<!-- Scope BEGIN: AudioObject -->';
$metadata_arr[] = '<div itemscope itemtype="http://schema.org/AudioObject"' . amt_get_schemaorg_itemref('attachment_audio') . '>';
} else {
// we do not currently support other attachment types, so we stop processing here
return $post_body;
}
// Metadata common to all attachments
// Do not add a publisher on personal websites (static front page is source of author profile).
if ($options['author_profile_source'] != 'frontpage' || !amt_has_page_on_front()) {
// Publisher
// Scope BEGIN: Organization: http://schema.org/Organization
$metadata_arr[] = '<!-- Scope BEGIN: Organization -->';
$metadata_arr[] = '<span itemprop="publisher" itemscope itemtype="http://schema.org/Organization"' . amt_get_schemaorg_itemref('organization') . '>';
// Get publisher metatags
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_publisher_metatags($options, $post->post_author));
// Scope END: Organization
$metadata_arr[] = '</span> <!-- Scope END: Organization -->';
}
// Author
// Scope BEGIN: Person: http://schema.org/Person
$metadata_arr[] = '<!-- Scope BEGIN: Person -->';
$metadata_arr[] = '<span itemprop="author" itemscope itemtype="http://schema.org/Person"' . amt_get_schemaorg_itemref('person_author') . '>';
// Get author metatags
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_author_metatags($post->post_author, $options));
// Scope END: Person
$metadata_arr[] = '</span> <!-- Scope END: Person -->';
// name
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr(strip_tags(get_the_title($post->ID))) . '" />';
// headline - contains title information
$metadata_arr['microdata:headline'] = '<meta itemprop="headline" content="' . esc_attr(amt_get_title_for_metadata($options, $post)) . '" />';
// Description - We use the description defined by Add-Meta-Tags
$content_desc = amt_get_content_description($post);
if (!empty($content_desc)) {
$metadata_arr[] = '<meta itemprop="description" content="' . esc_attr($content_desc) . '" />';
}
// Dates
$metadata_arr[] = '<meta itemprop="datePublished" content="' . esc_attr(amt_iso8601_date($post->post_date)) . '" />';
$metadata_arr[] = '<meta itemprop="dateModified" content="' . esc_attr(amt_iso8601_date($post->post_modified)) . '" />';
$metadata_arr[] = '<meta itemprop="copyrightYear" content="' . esc_attr(mysql2date('Y', $post->post_date)) . '" />';
// Language
$metadata_arr[] = '<meta itemprop="inLanguage" content="' . esc_attr(str_replace('-', '_', amt_get_language_content($options, $post))) . '" />';
// Thumbnail
// A featured image is supported by video and audio attachments.
// If one is set, then it is set as the thumbnail of the video/audio object.
if ('video' == $attachment_type || 'audio' == $attachment_type) {
if (function_exists('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
// Thumbnail URL of the featured image
$image_size = apply_filters('amt_image_size_attachment', 'full');
$thumbnail_info = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), $image_size);
$metadata_arr[] = '<meta itemprop="thumbnailUrl" content="' . esc_url_raw($thumbnail_info[0]) . '" />';
// Currently we do not add a full ImageObject for the attachment's featured image.
// TODO: future
}
}
// mainEntityOfPage
$metadata_arr[] = '<meta itemprop="mainEntityOfPage" content="' . esc_url(get_permalink($post->ID)) . '" />';
// Metadata specific to each attachment type
if ('image' == $attachment_type) {
// Allow filtering of the image size.
$image_size = apply_filters('amt_image_size_attachment', 'full');
// Get image metatags. $post is an image object.
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_image_metatags($options, $post, $size = $image_size, $is_representative = true));
// Add the post body here
$metadata_arr['content_data'] = $post_body;
// Scope END: ImageObject
$metadata_arr[] = '</div> <!-- Scope END: ImageObject -->';
} elseif ('video' == $attachment_type) {
// Video specific metatags
// URL (links to image file)
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( get_permalink( $post->ID ) ) . '" />';
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(wp_get_attachment_url($post->ID)) . '" />';
// sameAs (links to attachment page)
$metadata_arr[] = '<meta itemprop="sameAs" content="' . esc_url_raw(get_permalink($post->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw(wp_get_attachment_url($post->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="encodingFormat" content="' . esc_attr($mime_type) . '" />';
// Required by Google
$metadata_arr[] = '<meta itemprop="uploadDate" content="' . esc_attr(amt_iso8601_date($post->post_date)) . '" />';
// Add the post body here
$metadata_arr['content_data'] = $post_body;
// Scope END: VideoObject
$metadata_arr[] = '</div> <!-- Scope END: VideoObject -->';
} elseif ('audio' == $attachment_type) {
// Audio specific metatags
// URL (links to image file)
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( get_permalink( $post->ID ) ) . '" />';
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(wp_get_attachment_url($post->ID)) . '" />';
// sameAs (links to attachment page)
$metadata_arr[] = '<meta itemprop="sameAs" content="' . esc_url_raw(get_permalink($post->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw(wp_get_attachment_url($post->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="encodingFormat" content="' . esc_attr($mime_type) . '" />';
// Add the post body here
$metadata_arr['content_data'] = $post_body;
// Scope END: AudioObject
$metadata_arr[] = '</div> <!-- Scope END: AudioObject -->';
}
// Filtering of the generated Schema.org metadata
$metadata_arr = apply_filters('amt_schemaorg_metadata_attachment', $metadata_arr);
// Content
} else {
// Set main metadata entity. By default this set to Article.
$main_content_object = 'Article';
// Check for Page
// Main entity is set to WebPage on pages
// DEV NOTE: Since many themes already set the WebPage itemscope on the
// body element of the web page, set it to WebPage automatically would
// result in duplicate entities. So this has to be done manually via
// a filtering function.
// if ( is_page() ) {
// $main_content_object = 'WebPage';
// }
// Check for Review
$review_data = amt_get_review_data($post);
if (!empty($review_data)) {
$main_content_object = 'Review';
}
// Allow filtering the main metadata object for content.
$main_content_object = apply_filters('amt_schemaorg_object_main', $main_content_object);
// Scope BEGIN: Article: http://schema.org/Article
$metadata_arr[] = '<!-- Scope BEGIN: ' . esc_attr($main_content_object) . ' -->';
$metadata_arr[] = '<div itemscope itemtype="http://schema.org/' . esc_attr($main_content_object) . '"' . amt_get_schemaorg_itemref('content') . '>';
// Do not add a publisher on personal websites (static front page is source of author profile).
if ($options['author_profile_source'] != 'frontpage' || !amt_has_page_on_front()) {
// Publisher
// Scope BEGIN: Organization: http://schema.org/Organization
$metadata_arr[] = '<!-- Scope BEGIN: Organization -->';
$metadata_arr[] = '<span itemprop="publisher" itemscope itemtype="http://schema.org/Organization"' . amt_get_schemaorg_itemref('organization') . '>';
// Get publisher metatags
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_publisher_metatags($options, $post->post_author));
// Scope END: Organization
$metadata_arr[] = '</span> <!-- Scope END: Organization -->';
}
// Author
// Scope BEGIN: Person: http://schema.org/Person
$metadata_arr[] = '<!-- Scope BEGIN: Person -->';
$metadata_arr[] = '<span itemprop="author" itemscope itemtype="http://schema.org/Person"' . amt_get_schemaorg_itemref('person_author') . '>';
// Get publisher metatags
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_author_metatags($post->post_author, $options));
// Scope END: Person
$metadata_arr[] = '</span> <!-- Scope END: Person -->';
// URL - Uses amt_get_permalink_for_multipage()
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(amt_get_permalink_for_multipage($post)) . '" />';
// mainEntityOfPage
$metadata_arr[] = '<meta itemprop="mainEntityOfPage" content="' . esc_url(amt_get_permalink_for_multipage($post)) . '" />';
// Dates
$metadata_arr[] = '<meta itemprop="datePublished" content="' . esc_attr(amt_iso8601_date($post->post_date)) . '" />';
$metadata_arr[] = '<meta itemprop="dateModified" content="' . esc_attr(amt_iso8601_date($post->post_modified)) . '" />';
$metadata_arr[] = '<meta itemprop="copyrightYear" content="' . esc_attr(mysql2date('Y', $post->post_date)) . '" />';
// Language
$metadata_arr[] = '<meta itemprop="inLanguage" content="' . esc_attr(str_replace('-', '_', amt_get_language_content($options, $post))) . '" />';
// name
// Note: Contains multipage information through amt_process_paged()
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr(amt_process_paged(strip_tags(get_the_title($post->ID)))) . '" />';
// headline - contains title information
$metadata_arr['microdata:headline'] = '<meta itemprop="headline" content="' . esc_attr(amt_get_title_for_metadata($options, $post)) . '" />';
// Description - We use the description defined by Add-Meta-Tags
// Note: Contains multipage information through amt_process_paged()
$content_desc = amt_get_content_description($post);
if (!empty($content_desc)) {
$metadata_arr[] = '<meta itemprop="description" content="' . esc_attr(amt_process_paged($content_desc)) . '" />';
}
/*
// Section: We use the first category as the section
$first_cat = sanitize_text_field( amt_sanitize_keywords( amt_get_first_category($post) ) );
if (!empty($first_cat)) {
$metadata_arr[] = '<meta itemprop="articleSection" content="' . esc_attr( $first_cat ) . '" />';
}
*/
// Add articleSection in Article object only.
if ($main_content_object == 'Article') {
$categories = get_the_category($post->ID);
$categories = apply_filters('amt_post_categories_for_schemaorg', $categories);
foreach ($categories as $cat) {
$section = trim($cat->cat_name);
if (!empty($section) && $cat->slug != 'uncategorized') {
$metadata_arr[] = '<meta itemprop="articleSection" content="' . esc_attr($section) . '" />';
}
}
}
// Add review properties if Review
if ($main_content_object == 'Review') {
$metadata_arr[] = '<!-- Review Information BEGIN -->';
$metadata_arr[] = amt_get_review_info_box($review_data);
$metadata_arr[] = '<!-- Review Information END -->';
}
// Keywords - We use the keywords defined by Add-Meta-Tags
$keywords = amt_get_content_keywords($post);
if (!empty($keywords)) {
$metadata_arr[] = '<meta itemprop="keywords" content="' . esc_attr($keywords) . '" />';
}
// Referenced Items
$referenced_url_list = amt_get_referenced_items($post);
foreach ($referenced_url_list as $referenced_url) {
$referenced_url = trim($referenced_url);
if (!empty($referenced_url)) {
$metadata_arr[] = '<meta itemprop="referencedItem" content="' . esc_url_raw($referenced_url) . '" />';
}
}
// Images
// First check if a global image override URL has been entered.
// If yes, use this image URL and override all other images.
$image_data = amt_get_image_data(amt_get_post_meta_image_url($post->ID));
if (!empty($image_data)) {
$image_size = apply_filters('amt_image_size_content', 'full');
$image_meta_tags = amt_get_schemaorg_image_metatags($options, $image_data, $size = $image_size);
if (!empty($image_meta_tags)) {
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
$metadata_arr = array_merge($metadata_arr, $image_meta_tags);
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
//$global_image_override_url = amt_get_post_meta_image_url($post->ID);
//if ( ! empty( $global_image_override_url ) ) {
// $metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
// $metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// $metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( $global_image_override_url ) . '" />';
// $metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw( $global_image_override_url ) . '" />';
// $metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Further image processing
} else {
// Media Limits
$image_limit = amt_metadata_get_image_limit($options);
$video_limit = amt_metadata_get_video_limit($options);
$audio_limit = amt_metadata_get_audio_limit($options);
// Counters
$ic = 0;
// image counter
$vc = 0;
// video counter
$ac = 0;
// audio counter
// We store the featured image ID in this variable so that it can easily be excluded
// when all images are parsed from the $attachments array.
$featured_image_id = 0;
// Set to true if any image attachments are found. Use to finally add the default image
// if no image attachments have been found.
$has_images = false;
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
// Image - Featured image is checked first, so that it can be the first associated image.
if (function_exists('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
// Thumbnail URL
// First add the thumbnail URL of the featured image
$thumbnail_info = wp_get_attachment_image_src(get_post_thumbnail_id($post->ID), 'thumbnail');
$metadata_arr[] = '<meta itemprop="thumbnailUrl" content="' . esc_url_raw($thumbnail_info[0]) . '" />';
// Add full image object for featured image.
// Get the image attachment object
$image = get_post(get_post_thumbnail_id($post->ID));
// metadata BEGIN
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// Allow filtering of the image size.
$image_size = apply_filters('amt_image_size_content', 'full');
// Get image metatags.
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_image_metatags($options, $image, $size = $image_size));
// metadata END
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Finally, set the $featured_image_id
$featured_image_id = get_post_thumbnail_id($post->ID);
// Images have been found.
$has_images = true;
// Increase image counter
$ic++;
}
// Scope END: ImageObject
// Process all attachments and add metatags (featured image will be excluded)
foreach ($attachments as $attachment) {
// Excluded the featured image since
if ($attachment->ID != $featured_image_id) {
$mime_type = get_post_mime_type($attachment->ID);
//$attachment_type = strstr( $mime_type, '/', true );
// See why we do not use strstr(): http://www.codetrax.org/issues/1091
$attachment_type = preg_replace('#\\/[^\\/]*$#', '', $mime_type);
if ('image' == $attachment_type && $ic < $image_limit) {
// metadata BEGIN
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// Allow filtering of the image size.
$image_size = apply_filters('amt_image_size_content', 'full');
// Get image metatags.
$metadata_arr = array_merge($metadata_arr, amt_get_schemaorg_image_metatags($options, $attachment, $size = $image_size));
// metadata END
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Images have been found.
$has_images = true;
// Increase image counter
$ic++;
} elseif ('video' == $attachment_type && $vc < $video_limit) {
// Scope BEGIN: VideoObject: http://schema.org/VideoObject
$metadata_arr[] = '<!-- Scope BEGIN: VideoObject -->';
$metadata_arr[] = '<span itemprop="video" itemscope itemtype="http://schema.org/VideoObject">';
// Video specific metatags
// URL (links to image file)
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( get_permalink( $attachment->ID ) ) . '" />';
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(wp_get_attachment_url($attachment->ID)) . '" />';
// sameAs (links to attachment page)
$metadata_arr[] = '<meta itemprop="sameAs" content="' . esc_url_raw(get_permalink($attachment->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw(wp_get_attachment_url($attachment->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="encodingFormat" content="' . esc_attr($mime_type) . '" />';
// name
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr(strip_tags(get_the_title($attachment->ID))) . '" />';
// Description - We use the description defined by Add-Meta-Tags
$content_desc = amt_get_content_description($attachment);
if (!empty($content_desc)) {
$metadata_arr[] = '<meta itemprop="description" content="' . esc_attr($content_desc) . '" />';
}
// Thumbnail
// A featured image is supported by video and audio attachments.
// If one is set, then it is set as the thumbnail of the video/audio object.
if (function_exists('has_post_thumbnail') && has_post_thumbnail($attachment->ID)) {
// Thumbnail URL of the featured image
$image_size = apply_filters('amt_image_size_content', 'full');
$thumbnail_info = wp_get_attachment_image_src(get_post_thumbnail_id($attachment->ID), $image_size);
$metadata_arr[] = '<meta itemprop="thumbnailUrl" content="' . esc_url_raw($thumbnail_info[0]) . '" />';
// Currently we do not add a full ImageObject for the attachment's featured image.
// TODO: future
}
// uploadDate
$metadata_arr[] = '<meta itemprop="uploadDate" content="' . esc_attr(amt_iso8601_date($attachment->post_date)) . '" />';
// Scope END: VideoObject
$metadata_arr[] = '</span> <!-- Scope END: VideoObject -->';
// Increase video counter
$vc++;
} elseif ('audio' == $attachment_type && $ac < $audio_limit) {
// Scope BEGIN: AudioObject: http://schema.org/AudioObject
$metadata_arr[] = '<!-- Scope BEGIN: AudioObject -->';
$metadata_arr[] = '<span itemprop="audio" itemscope itemtype="http://schema.org/AudioObject">';
// Audio specific metatags
// URL (links to image file)
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( get_permalink( $attachment->ID ) ) . '" />';
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw(wp_get_attachment_url($attachment->ID)) . '" />';
// sameAs (links to attachment page)
$metadata_arr[] = '<meta itemprop="sameAs" content="' . esc_url_raw(get_permalink($attachment->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw(wp_get_attachment_url($attachment->ID)) . '" />';
$metadata_arr[] = '<meta itemprop="encodingFormat" content="' . esc_attr($mime_type) . '" />';
// name
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr(strip_tags(get_the_title($attachment->ID))) . '" />';
// Description - We use the description defined by Add-Meta-Tags
$content_desc = amt_get_content_description($attachment);
if (!empty($content_desc)) {
$metadata_arr[] = '<meta itemprop="description" content="' . esc_attr($content_desc) . '" />';
}
// Thumbnail
// A featured image is supported by video and audio attachments.
// If one is set, then it is set as the thumbnail of the video/audio object.
if (function_exists('has_post_thumbnail') && has_post_thumbnail($attachment->ID)) {
// Thumbnail URL of the featured image
$image_size = apply_filters('amt_image_size_content', 'full');
$thumbnail_info = wp_get_attachment_image_src(get_post_thumbnail_id($attachment->ID), $image_size);
$metadata_arr[] = '<meta itemprop="thumbnailUrl" content="' . esc_url_raw($thumbnail_info[0]) . '" />';
// Currently we do not add a full ImageObject for the attachment's featured image.
// TODO: future
}
// uploadDate
$metadata_arr[] = '<meta itemprop="uploadDate" content="' . esc_attr(amt_iso8601_date($attachment->post_date)) . '" />';
// Scope END: AudioObject
$metadata_arr[] = '</span> <!-- Scope END: AudioObject -->';
// Increase audio counter
$ac++;
}
}
}
// Embedded Media
foreach ($embedded_media['images'] as $embedded_item) {
if ($ic == $image_limit) {
break;
}
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
// name (title)
$metadata_arr[] = '<meta itemprop="name" content="' . esc_attr($embedded_item['alt']) . '" />';
// caption
$metadata_arr[] = '<meta itemprop="caption" content="' . esc_attr($embedded_item['alt']) . '" />';
// alt
$metadata_arr[] = '<meta itemprop="text" content="' . esc_attr($embedded_item['alt']) . '" />';
// URL (links to image file)
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( $embedded_item['page'] ) . '" />';
$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw($embedded_item['image']) . '" />';
// sameAs (links to attachment page)
$metadata_arr[] = '<meta itemprop="sameAs" content="' . esc_url_raw($embedded_item['page']) . '" />';
// thumbnail url
$metadata_arr[] = '<meta itemprop="thumbnailUrl" content="' . esc_url_raw($embedded_item['thumbnail']) . '" />';
// main image
$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw($embedded_item['image']) . '" />';
if (apply_filters('amt_extended_image_tags', true)) {
$metadata_arr[] = '<meta itemprop="width" content="' . esc_attr($embedded_item['width']) . '" />';
$metadata_arr[] = '<meta itemprop="height" content="' . esc_attr($embedded_item['height']) . '" />';
$metadata_arr[] = '<meta itemprop="encodingFormat" content="image/jpeg" />';
}
// embedURL
$metadata_arr[] = '<meta itemprop="embedURL" content="' . esc_url_raw($embedded_item['player']) . '" />';
// Scope END: ImageObject
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
// Images have been found.
$has_images = true;
// Increase image counter
$ic++;
}
foreach ($embedded_media['videos'] as $embedded_item) {
if ($vc == $video_limit) {
break;
}
// Scope BEGIN: VideoObject: http://schema.org/VideoObject
// See: http://googlewebmastercentral.blogspot.gr/2012/02/using-schemaorg-markup-for-videos.html
// See: https://support.google.com/webmasters/answer/2413309?hl=en
$metadata_arr[] = '<!-- Scope BEGIN: VideoObject -->';
$metadata_arr[] = '<span itemprop="video" itemscope itemtype="http://schema.org/VideoObject">';
// Video Embed URL
$metadata_arr[] = '<meta itemprop="embedURL" content="' . esc_url_raw($embedded_item['player']) . '" />';
// playerType
$metadata_arr[] = '<meta itemprop="playerType" content="application/x-shockwave-flash" />';
// size
$metadata_arr[] = '<meta itemprop="width" content="' . esc_attr($embedded_item['width']) . '" />';
$metadata_arr[] = '<meta itemprop="height" content="' . esc_attr($embedded_item['height']) . '" />';
// Scope END: VideoObject
$metadata_arr[] = '</span> <!-- Scope END: VideoObject -->';
// Increase video counter
$vc++;
}
foreach ($embedded_media['sounds'] as $embedded_item) {
if ($ac == $audio_limit) {
break;
}
// Scope BEGIN: AudioObject: http://schema.org/AudioObject
$metadata_arr[] = '<!-- Scope BEGIN: AudioObject -->';
$metadata_arr[] = '<span itemprop="audio" itemscope itemtype="http://schema.org/AudioObject">';
// Audio Embed URL
$metadata_arr[] = '<meta itemprop="embedURL" content="' . esc_url_raw($embedded_item['player']) . '" />';
// playerType
$metadata_arr[] = '<meta itemprop="playerType" content="application/x-shockwave-flash" />';
// Scope END: AudioObject
$metadata_arr[] = '</span> <!-- Scope END: AudioObject -->';
// Increase audio counter
$ac++;
}
// If no images have been found so far use the default image, if set.
// Scope BEGIN: ImageObject: http://schema.org/ImageObject
if ($has_images === false) {
$image_data = amt_get_default_image_data();
if (!empty($image_data)) {
$image_size = apply_filters('amt_image_size_content', 'full');
$image_meta_tags = amt_get_schemaorg_image_metatags($options, $image_data, $size = $image_size);
if (!empty($image_meta_tags)) {
$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
$metadata_arr = array_merge($metadata_arr, $image_meta_tags);
$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
}
//$metadata_arr[] = '<!-- Scope BEGIN: ImageObject -->';
//$metadata_arr[] = '<span itemprop="image" itemscope itemtype="http://schema.org/ImageObject">';
//$metadata_arr[] = '<meta itemprop="url" content="' . esc_url_raw( $options["default_image_url"] ) . '" />';
//$metadata_arr[] = '<meta itemprop="contentUrl" content="' . esc_url_raw( $options["default_image_url"] ) . '" />';
//$metadata_arr[] = '</span> <!-- Scope END: ImageObject -->';
}
// Scope END: ImageObject
}
// Article Body
// The article body is added after filtering the generated microdata below.
// TODO: also check: comments, contributor, copyrightHolder, , creator, dateCreated, discussionUrl, editor, version (use post revision if possible)
// Scope END: Article
$metadata_arr[] = '</div> <!-- Scope END: ' . esc_attr($main_content_object) . ' -->';
// Filtering of the generated Schema.org metadata
$metadata_arr = apply_filters('amt_schemaorg_metadata_content', $metadata_arr);
// Add articleBody to Artice
// Now add the article. Remove last closing '</span>' tag, add articleBody and re-add the closing span afterwards.
$closing_article_tag = array_pop($metadata_arr);
// Use the 'text' itemprop by default for the main text body of the CreativeWork,
// so it can be used by more subtypes than Article.
// But set it explicitly to 'articleBody if the main entiry is 'Article'
// or 'reviewBody' if the main entity is a 'Review'.
$main_text_property = 'text';
if ($main_content_object == 'Article') {
$main_text_property = 'articleBody';
} elseif ($main_content_object == 'Review') {
$main_text_property = 'reviewBody';
}
// Allow filtering of the main text property.
$main_text_property = apply_filters('amt_schemaorg_property_main_text', $main_text_property);
$metadata_arr[] = '<div itemprop="' . esc_attr($main_text_property) . '">';
$metadata_arr['content_data'] = $post_body;
$metadata_arr[] = '</div> <!-- Itemprop END: ' . esc_attr($main_text_property) . ' -->';
// Now add closing tag for Article
$metadata_arr[] = $closing_article_tag;
}
// Store transient cache of content metadata
if (absint($options['transient_cache_expiration']) > 0 && apply_filters('amt_enable_metadata_cache_in_content_filter', true)) {
if (!empty($metadata_arr)) {
amt_set_transient_cache($post, $options, $metadata_arr, $where = 'content');
}
}
// Add our comment
if (count($metadata_arr) > 0) {
// For AMT timings
if ($options['enable_timings'] == '1') {
array_unshift($metadata_arr, sprintf('<!-- Add-Meta-Tags Timings (milliseconds) - Block total time: %.3f msec - Cached: %s -->', (microtime(true) - $t) * 1000, $is_cached));
}
if ($options["omit_vendor_html_comments"] == "0") {
array_unshift($metadata_arr, "<!-- BEGIN Schema.org microdata added by the Add-Meta-Tags WordPress plugin -->");
}
array_unshift($metadata_arr, "");
// Intentionaly left empty
if ($options["omit_vendor_html_comments"] == "0") {
array_push($metadata_arr, "<!-- END Schema.org microdata added by the Add-Meta-Tags WordPress plugin -->");
}
array_push($metadata_arr, "");
// Intentionaly left empty
}
//
// Non persistent cache for metadata review mode.
//
// The review mode's content filter should have bigger priority than this
// filter (be executed after this one). This one by default has priority 9999
// while the review mode filter has priority of 10000
if (amt_check_run_metadata_review_code($options)) {
// What happens here is this: we copy the metadata array and remove the
// item that contains the content data, because it is not needed for
// metadata review.
// Then use non-persistent cache to store this new array.
// Metadata Review mode's filtering function should be attached with a
// priority bigger than this one, so that it is executed after this one.
// There the data is loaded from the non-persistent cache.
// This way, the timings are the same as in the source code and also
// it is more efficient from a resources perspective.
// WARNING: in order to work fine, set correct filter priorities.
$metadata_arr_for_review = $metadata_arr;
if (array_key_exists('content_data', $metadata_arr_for_review)) {
$metadata_arr_for_review['content_data'] = ' <!-- The content has been removed from the metadata review. -->';
}
wp_cache_add('amt_cache_metadata_block_content_filter', $metadata_arr_for_review, $group = 'add-meta-tags');
unset($metadata_arr_for_review);
}
//return $post_body;
return implode(PHP_EOL, $metadata_arr);
}
/**
* Prints the generated metadata for the footer area.
*/
function amt_add_metadata_footer()
{
// For AMT timings
$t = microtime(true);
// Get the options the DB
$options = get_option("add_meta_tags_opts");
// Get current post object
$post = amt_get_queried_object();
// Caching indicator
$is_cached = 'no';
// Get the metadata
// NOTE: Currently metadata is cached for content pages only (is_singular())
if (absint($options['transient_cache_expiration']) > 0 && apply_filters('amt_enable_metadata_cache', true)) {
$metadata_arr = amt_get_transient_cache($post, $options, $where = 'footer');
if (empty($metadata_arr)) {
$metadata_arr = amt_get_metadata_footer($post, $options);
// Cache the metadata
if (!empty($metadata_arr)) {
amt_set_transient_cache($post, $options, $metadata_arr, $where = 'footer');
}
} else {
$is_cached = 'yes';
}
} else {
$metadata_arr = amt_get_metadata_footer($post, $options);
}
// For AMT timings
if (!empty($metadata_arr) && $options['enable_timings'] == '1') {
array_unshift($metadata_arr, sprintf('<!-- Add-Meta-Tags Timings (milliseconds) - Block total time: %.3f msec - Cached: %s -->', (microtime(true) - $t) * 1000, $is_cached));
}
// Add our comment
if ($options["omit_vendor_html_comments"] == "0") {
if (count($metadata_arr) > 0) {
array_unshift($metadata_arr, "<!-- BEGIN Metadata added by the Add-Meta-Tags WordPress plugin -->");
array_push($metadata_arr, "<!-- END Metadata added by the Add-Meta-Tags WordPress plugin -->");
}
}
// Return complete metadata array
return $metadata_arr;
}