The pings_open hook in WordPress is used to determine whether or not trackbacks and pingbacks are allowed for a particular post. This hook is fired in the wp-includes/comment.php file when a post is being queried for its pingback/trackback status.
By default, this hook returns a boolean value of true or false based on whether or not the post type allows pingbacks and trackbacks. However, developers can modify the return value of this hook to customize the pingback/trackback status of a post.
Here’s an example usage code for the pings_open hook:
function disable_pingbacks( $open, $post_id ) {
if ( get_post_type( $post_id ) === 'my_custom_post_type' ) {
return false;
}
return $open;
}
add_filter( 'pings_open', 'disable_pingbacks', 10, 2 );
In this example, we’re using the pings_open hook to disable pingbacks and trackbacks for a custom post type called "my_custom_post_type." We do this by checking if the post type is our custom post type, and if so, we return false to disable pingbacks/trackbacks. If the post type is not our custom post type, we return the original value of $open
to allow pingbacks/trackbacks.