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<?php
add_action('peepso_action_group_user_invitation_send', 'hook', 10, 1);
 
function hook(PeepSoGroupUser $PeepSoGroupUser) {
    $msg = 'User ' . get_current_user_id() . ' invited user {$PeepSoGroupUser->$user_id} to group {$PeepSoGroupUser->$group_id}';
    error_log($msg);
}