Wordpress - How to use same email for multiple users
You can use wpmu_validate_user_signup
filter to remove the error and then define WP_IMPORTING
just to skip the email_exist()
check in wp_insert_user()
function:
add_filter('wpmu_validate_user_signup', 'skip_email_exist');
function skip_email_exist($result){
if(isset($result['errors']->errors['user_email']) && ($key = array_search(__('Sorry, that email address is already used!'), $result['errors']->errors['user_email'])) !== false) {
unset($result['errors']->errors['user_email'][$key]);
if (empty($result['errors']->errors['user_email'])) unset($result['errors']->errors['user_email']);
}
define( 'WP_IMPORTING', 'SKIP_EMAIL_EXIST' );
return $result;
}
UPDATE: for a non Multi-site setup try this code:
add_filter('pre_user_email', 'skip_email_exist');
function skip_email_exist($user_email){
define( 'WP_IMPORTING', 'SKIP_EMAIL_EXIST' );
return $user_email;
}