我创建了一个插件，可以将当天X点之前下的所有订单发送到电子邮件Y。我在这里遵循了教程：https://scotch.io/tutorials/how-to-build-a-wordpress-plugin-part-1

在每次选项更新时，它会删除所有计划的事件并添加新的事件。出于某种原因，我不明白，只要有人以管理员身份登录主页，就会发送电子邮件。一旦我更改并保存设置，它就会停止。以下是我认为相关的代码：

public function options_update() {
    register_setting($this->plugin_name, $this->plugin_name, array($this, \'validate\'));
    wp_clear_scheduled_hook(\'send_woocommerce_daily_order_summary_email\');
    $options = get_option($this->plugin_name);
    $timestamp = strtotime($options[\'send_time\'] . ":00:00 " . get_option(\'timezone_string\'));
    wp_schedule_event($timestamp, \'daily\', \'send_woocommerce_daily_order_summary_email\');
}

private function define_admin_hooks() {
    $plugin_admin = new Woocommerce_Daily_Order_Summary_Email_Admin( $this->get_plugin_name(), $this->get_version() );

    $this->loader->add_action( \'admin_enqueue_scripts\', $plugin_admin, \'enqueue_styles\' );
    $this->loader->add_action( \'admin_enqueue_scripts\', $plugin_admin, \'enqueue_scripts\' );

    // Add menu item
    $this->loader->add_action( \'admin_menu\', $plugin_admin, \'add_plugin_admin_menu\' );

    // Add Settings link to the plugin
    $plugin_basename = plugin_basename( plugin_dir_path( __DIR__ ) . $this->plugin_name . \'.php\' );
    $this->loader->add_filter( \'plugin_action_links_\' . $plugin_basename, $plugin_admin, \'add_action_links\' );

    // Save/Update our plugin options
    $this->loader->add_action(\'admin_init\', $plugin_admin, \'options_update\');
}