public static function activity_admin_page() { if (isset($_GET['action']) || isset($_GET['signup_action'])) { if ($_GET['action'] == 'activity_admin_setting') { self::activity_admin_setting(); } elseif ($_GET['action'] == 'activity_admin_delete_post') { self::activity_admin_delete_post(); } elseif ($_GET['action'] == 'activity_admin_post') { self::activity_admin_post($_GET['post_action']); } elseif ($_GET['action'] == 'activity_admin_process_post') { self::activity_admin_process_post(); } elseif ($_GET['action'] == 'error_add_activity') { self::error_add_activity(); } elseif ($_GET['signup_action'] == 'view') { Activity_Signup::activity_signup_list(); } elseif ($_GET['signup_action'] == 'delete') { Activity_Signup::activity_signup_delete(); } elseif ($_GET['signup_action'] == 'edit') { Activity_Signup::activity_signup_detail(); } elseif ($_GET['signup_action'] == 'add') { Activity_Signup::activity_signup_detail(); } elseif ($_GET['signup_action'] == 'process') { Activity_Signup::activity_signup_process_signup(); } } else { self::activity_admin_display_activity(); } }