如果自定义字段具有值，则从YOAST站点地图中动态移除事件

function remove_from_yoast_sitemap() {
    $custom_field = get_post_meta( get_the_ID(), 'custom_field', true );
    
    if ( $custom_field === 'remove' ) {
        $post_id = get_the_ID();
        $sitemap_url = get_home_url() . '/sitemap_index.xml';
        
        $response = wp_remote_get( $sitemap_url );
        
        if ( ! is_wp_error( $response ) && $response['response']['code'] === 200 ) {
            $sitemap = simplexml_load_string( $response['body'] );
            
            foreach ( $sitemap->sitemap as $sitemap_item ) {
                $sitemap_item_url = (string) $sitemap_item->loc;
                
                if ( strpos( $sitemap_item_url, 'post-sitemap.xml' ) !== false ) {
                    $post_sitemap_response = wp_remote_get( $sitemap_item_url );
                    
                    if ( ! is_wp_error( $post_sitemap_response ) && $post_sitemap_response['response']['code'] === 200 ) {
                        $post_sitemap = simplexml_load_string( $post_sitemap_response['body'] );
                        
                        foreach ( $post_sitemap->url as $url ) {
                            $url_loc = (string) $url->loc;
                            
                            if ( strpos( $url_loc, 'post_type=post' ) !== false && strpos( $url_loc, 'p=' . $post_id ) !== false ) {
                                $url->addChild( 'changefreq', 'never' );
                                $url->addChild( 'priority', '0.0' );
                            }
                        }
                        
                        $post_sitemap_response = wp_remote_post( $sitemap_item_url, array(
                            'headers' => array( 'Content-Type' => 'application/xml; charset=UTF-8' ),
                            'body'    => $post_sitemap->asXML(),
                        ) );
                    }
                }
            }
        }
    }
}
add_action( 'wp', 'remove_from_yoast_sitemap' );