|wp-includes/user.php: sanitize_user_field()|| |
Sanitize user field based on context.
Filters the value of a user field in the ‘db’ context.
The dynamic portion of the hook name,
$field, refers to the prefixed user field being filtered, such as ‘user_login’, ‘user_email’, ‘first_name’, etc.
(mixed) Value of the prefixed user field.
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