apply_filters( 'signup_user_meta', array $meta, string $user, string $user_email, string $key )
Filters the metadata for a user signup.
Description
The metadata will be serialized prior to storing it in the database.
Parameters
- $meta
 -  
(array) Signup meta data. Default empty array.
 - $user
 -  
(string) The user's requested login name.
 - $user_email
 -  
(string) The user's email address.
 - $key
 -  
(string) The user's activation key.
 
Source
Changelog
| Version | Description | 
|---|---|
| 4.8.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/hooks/signup_user_meta