Using WordPress ‘get_object_subtype()’ PHP function

The get_object_subtype() WordPress PHP function returns the object subtype for a given object ID of a specific type.

Usage

get_object_subtype( $object_type, $object_id );

$object_type (string) – Required. Type of object metadata is for. Accepts ‘post’, ‘comment’, ‘term’, ‘user’, or any other object type with an associated meta table.
$object_id (int) – Required. ID of the object to retrieve its subtype.

See WordPress Developer Resources: get_object_subtype()

Retrieve the subtype of a post with the ID 123.

$post_id = 123;
$post_subtype = get_object_subtype( 'post', $post_id );

Retrieve the subtype of a comment with the ID 456.

$comment_id = 456;
$comment_subtype = get_object_subtype( 'comment', $comment_id );

Retrieve the subtype of a term with the ID 789.

$term_id = 789;
$term_subtype = get_object_subtype( 'term', $term_id );

Retrieve the subtype of a user with the ID 101112.

$user_id = 101112;
$user_subtype = get_object_subtype( 'user', $user_id );

Retrieve the subtype of a custom object type ‘my_custom_type’ with the ID 131415.

$custom_object_id = 131415;
$custom_object_subtype = get_object_subtype( 'my_custom_type', $custom_object_id );