Code-Snippets-Functions/Execute a function on a child site/BuddyPress/disable-posting-for-specific-users.txt

function bp_disable_activity_for_specific_users() {

    $forbidden_users_ids  = array( 10, 33, 40 );

    if ( in_array( bp_loggedin_user_id(), $forbidden_users_ids ) ) {
        add_filter( 'bp_is_wall_posting_form_active', '__return_false' );
    }

}

add_action( 'bp_init', 'bp_disable_activity_for_specific_users' );