Admin_Apple_Settings_Section::save_settings PHP Method

    public function save_settings()
    {
        // Check if we're saving options and that there are settings to svae
        if (empty($_POST['action']) || 'apple_news_options' !== $_POST['action'] || empty($this->settings)) {
            return;
        }
        // Form nonce check
        check_admin_referer('apple_news_options', 'apple_news_options');
        // Get the current Apple News settings
        $settings = get_option(self::$option_name, array());
        // Iterate over the settings and save each value.
        // Settings can't be empty unless allowed, so if no value is found
        // use the default value to be safe.
        $default_settings = new Settings();
        foreach ($this->settings as $key => $attributes) {
            if (!empty($_POST[$key])) {
                // Sanitize the value
                $sanitize = empty($attributes['sanitize']) || !is_callable($attributes['sanitize']) ? 'sanitize_text_field' : $attributes['sanitize'];
                $value = call_user_func($sanitize, $_POST[$key]);
            } else {
                // Use the default value
                $value = $default_settings->get($key);
            }
            // Add to the array
            $settings[$key] = $value;
        }
        // Clear certain caches
        delete_transient('apple_news_sections');
        // Save to options
        update_option(self::$option_name, $settings, 'no');
    }