创建插件（初学者）时，我无法显示菜单的子菜单。你能帮我找出我的错误吗？我的插件激活良好，menu\\u页面显示良好

add_action(\'admin_menu\',\'tictac_admin_menu_option\');

function tictac_admin_menu_option()
{
  add_menu_page(
  \'Gestion des Horaires\',
  \'Time Control\',
  \'manage_options\',
  \'tictac_admin_menu\',
  \'tictac_scripts_page\',
  //plugins_url( \'time-control/admin/logo/tictac-logo.png\' ),
  \'dashicons-calendar-alt\'
  //16
  );
  add_submenu_page(\'tictac_admin_menu\',
  \'Sous menu Opening\',
  \'Options Opening\',
  \'tictac_admin_submenu\',
  \'tictac_scripts_menu\',
  \'tictac_opening_submenu\'
  );

}
function tictac_opening_submenu()
{
  ?>
  <div id="wrap">
    <h1>Add Opening</h1>
  </div>
  <?php
}