// add the schedule event if it has been removed 
if( ! wp_next_scheduled( \'mg_remove_old_entries\' ) ) {
  wp_schedule_event( time(), \'daily\', \'mg_remove_old_entries\' ); //run the event daily
}

// action hooked to fired with wordpress cron job
add_action( \'mg_remove_old_entries\', \'mg_remove_old_entries\' );
function mg_remove_old_entries() {
  $posts = get_posts( [
    \'numberposts\' => -1,
    \'post_type\' => \'vfb_entry\',
    \'date_query\' => [
      // get all the posts from the database which are older than 60 days
      \'before\' => date( "Y-m-d H:i:s", strtotime( \'-60 days\' ) ),
    ],
  ]);

  if( !empty($posts) ) {
    foreach( $posts as $post ) {
      wp_delete_post( $post->ID ); //remove the post from the database
    }
  }
}

// Cron Job to Delete VFB Entries older than 60 days
if(!wp_next_scheduled( \'remove_old_vfb_entries\')){
    wp_schedule_event(time(), \'daily\', \'remove_old_vfb_entries\');
}
add_action(\'remove_old_vfb_entries\', \'myd_remove_old_vfb_entries\');

// Build the function
function myd_remove_old_vfb_entries(){
global $wpdb;
// Set max post date and post_type name
$date = date("Y-m-d H:i:s", strtotime(\'-60 days\'));
$post_type = \'vfb_entry\';

// Build the query 
// Only Delete Entries from Form 5 and 8
$query = "
    SELECT $wpdb->posts.ID FROM $wpdb->posts 
    INNER JOIN $wpdb->postmeta 
      ON $wpdb->posts.ID = $wpdb->postmeta.post_id 
    WHERE post_type = \'$post_type\' 
    AND post_status = \'publish\' 
    AND $wpdb->postmeta.meta_key = \'_vfb_form_id\' 
    AND ($wpdb->postmeta.meta_value = 5 OR $wpdb->postmeta.meta_value = 8) 
    AND post_date < \'$date\' 
";
$results = $wpdb->get_results($query);
            foreach($results as $post){
                // Let the WordPress API clean up the entire post trails
                wp_delete_post( $post->ID, true);
          }
}

我想删除超过60天的特定帖子类型（在本例中为“vfb\\U条目”）的所有帖子。cron作业应每天运行一次。

第一步是设置cron作业。问题中的代码对于这一部分是正确的，因此它基本上复制到下面。

第二部分需要在数据库中查询条目超过60天的特定帖子类型。我们可以用get_posts() 并指定post_type 参数和date_query 论点

//* If the scheduled event got removed from the cron schedule, re-add it
if( ! wp_next_scheduled( \'wpse_213720_remove_old_entries\' ) ) {
  wp_schedule_event( time(), \'daily\', \'wpse_213720_remove_old_entries\' );
}

//* Add action to hook fired by cron event
add_action( \'wpse_213720_remove_old_entries\', \'wpse_213720_remove_old_entries\' );
function wpse_213720_remove_old_entries() {
  //* Get all the custom post type entries older than 60 days...
  $posts = get_posts( [
    \'numberposts\' => -1,
    \'post_type\' => \'wpse_262471_post_type\',
    \'date_query\' => [
      \'before\' => date( "Y-m-d H:i:s", strtotime( \'-60 days\' ) ),
    ],
  ]);
  //* ...and delete them
  array_filter( function( $post ) {
    wp_delete_post( $post->ID );
  }, $posts );
}