apply_filters( "default_{$meta_type}_metadata", mixed $value, int $object_id, string $meta_key, bool $single, string $meta_type )
Filters the default metadata value for a specified meta key and object.
Description
The dynamic portion of the hook, $meta_type, refers to the meta object type (post, comment, term, user, or any other type with an associated meta table).
Possible filter names include:
- default_post_metadata
- default_comment_metadata
- default_term_metadata
- default_user_metadata
Parameters
- $value
-  (mixed) The value to return, either a single metadata value or an array of values depending on the value of $single.
- $object_id
-  (int) ID of the object metadata is for. 
- $meta_key
-  (string) Metadata key. 
- $single
-  (bool) Whether to return only the first value of the specified $meta_key.
- $meta_type
-  (string) Type of object metadata is for. Accepts 'post', 'comment', 'term', 'user', or any other object type with an associated meta table. 
Source
File: wp-includes/meta.php
Changelog
| Version | Description | 
|---|---|
| 5.5.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/hooks/default_meta_type_metadata