Description
Use this filter to modify whether a user that currently has a status of unsubscribed on your list is resubscribed. By default, the user is resubscribed.
Usage
add_filter( 'gform_mailchimp_allow_resubscription', '__return_false' );
You can also specify this per form by adding the form id after the hook name.
add_filter( 'gform_mailchimp_allow_resubscription_1', '__return_false' );
Parameters
There are no parameters.
Examples
Prevent users from being resubscribed.
This example returns false so that users are not resubscribed:
add_filter( 'gform_mailchimp_allow_resubscription', '__return_false' );
Placement
This code can be used in the functions.php file of the active theme, a custom functions plugin, a custom add-on, or with a code snippets plugin.
See also the PHP section in this article: Where Do I Put This Code?
Source Code
This filter is located in mailchimp.php.