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* @return string|array|false

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public static function get_last_modified_gmt( $post_types, $return_all = false ) {

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global $wpdb;

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static $post_type_dates = null;

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if ( ! is_array( $post_types ) ) {

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$post_types = [ $post_types ];

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}

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foreach ( $post_types as $post_type ) {

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if ( ! isset( $post_type_dates[ $post_type ] ) ) { // If we hadn't seen post type before. R.

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$post_type_dates = null;

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break;

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}

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}

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if ( is_null( $post_type_dates ) ) {

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$post_type_dates = [];

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$post_type_names = WPSEO_Post_Type::get_accessible_post_types();

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if ( ! empty( $post_type_names ) ) {

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$post_statuses = array_map( 'esc_sql', self::get_post_statuses() );

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$replacements = array_merge(

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[

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'post_type',

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'post_modified_gmt',

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'date',

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$wpdb->posts,

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'post_status',

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$post_statuses,

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[ 'post_type' ],

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array_keys( $post_type_names ),

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[

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'post_type',

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'date',

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]

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);

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//phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching -- We need to use a direct query here.

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//phpcs:disable WordPress.DB.DirectDatabaseQuery.NoCaching -- Reason: No relevant caches.

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$dates = $wpdb->get_results(

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//phpcs:disable WordPress.DB.PreparedSQLPlaceholders -- %i placeholder is still not recognized.

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$wpdb->prepare(

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SELECT %i, MAX(%i) AS %i

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FROM %i

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WHERE %i IN (' . implode( ', ', array_fill( 0, count( $post_statuses ), '%s' ) ) . ')

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AND %i IN (' . implode( ', ', array_fill( 0, count( $post_type_names ), '%s' ) ) . ')

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GROUP BY %i

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ORDER BY %i DESC

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$replacements

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)

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);

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foreach ( $dates as $obj ) {

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$post_type_dates[ $obj->post_type ] = $obj->date;

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}

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}

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}

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$dates = array_intersect_key( $post_type_dates, array_flip( $post_types ) );

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if ( count( $dates ) > 0 ) {

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if ( $return_all ) {

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return $dates;

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}

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return max( $dates );

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}

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return false;

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}

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/**

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* Get the modification date for the last modified post in the post type.

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* @param array $post_types Post types to get the last modification date for.

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* @return string

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public function get_last_modified( $post_types ) {

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return YoastSEO()->helpers->date->format( self::get_last_modified_gmt( $post_types ) );

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}

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/**

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* Get the maximum number of entries per XML sitemap.

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* @return int The maximum number of entries.

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protected function get_entries_per_page() {

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/**

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* Filter the maximum number of entries per XML sitemap.

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* After changing the output of the filter, make sure that you disable and enable the

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* sitemaps to make sure the value is picked up for the sitemap cache.

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* @param int $entries The maximum number of entries per XML sitemap.

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$entries = (int) apply_filters( 'wpseo_sitemap_entries_per_page', 1000 );

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return $entries;

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}

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/**

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* Get post statuses for post_type or the root sitemap.

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* @since 10.2

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* @param string $type Provide a type for a post_type sitemap, SITEMAP_INDEX_TYPE for the root sitemap.

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* @return array List of post statuses.

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public static function get_post_statuses( $type = self::SITEMAP_INDEX_TYPE ) {

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/**

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* Filter post status list for sitemap query for the post type.

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* @param array $post_statuses Post status list, defaults to array( 'publish' ).

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* @param string $type Post type or SITEMAP_INDEX_TYPE.

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$post_statuses = apply_filters( 'wpseo_sitemap_post_statuses', [ 'publish' ], $type );

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if ( ! is_array( $post_statuses ) || empty( $post_statuses ) ) {

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$post_statuses = [ 'publish' ];

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}

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if ( ( $type === self::SITEMAP_INDEX_TYPE || $type === 'attachment' )

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&& ! in_array( 'inherit', $post_statuses, true )

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) {

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$post_statuses[] = 'inherit';

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}

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return $post_statuses;

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}

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/**

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* Sends all the required HTTP Headers.

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* @return void

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private function send_headers() {

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if ( headers_sent() ) {

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return;

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}

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$headers = [

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$this->http_protocol . ' 200 OK' => 200,

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// Prevent the search engines from indexing the XML Sitemap.

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'X-Robots-Tag: noindex, follow' => '',

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'Content-Type: text/xml; charset=' . esc_attr( $this->renderer->get_output_charset() ) => '',

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];

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/**

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* Filter the HTTP headers we send before an XML sitemap.

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* @param array $headers The HTTP headers we're going to send out.

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$headers = apply_filters( 'wpseo_sitemap_http_headers', $headers );

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foreach ( $headers as $header => $status ) {

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if ( is_numeric( $status ) ) {

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header( $header, true, $status );

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continue;

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}

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header( $header, true );

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}

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}

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}

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