获取选项（）

$ option 的参数列表

• ‘ADMIN_EMAIL’
• ‘BLOGNAME’
• ‘blogdescription’
• ‘blog_charset’
• ‘日期格式’
• ‘default_category’
• ‘家’
• ‘SITEURL’
• ‘模板’
• ‘start_of_week’
• ‘upload_path’
• ‘users_can_register’
• ‘posts_per_page’
• ‘posts_per_rss’