判断是否为ID17, 或别名为"beef-stew", 或标题为 "Irish Stew"的单篇日志.
判断是否为ID 17, 19, 1, 11 的文章.
判断是否别名为 "beef-stew", 别名为 "pea-soup" 或 别名为 "chili" 的单篇日志.
判断是否标题为 "Beef Stew",标题为 "Pea Soup" 或标题为 "Chili" 的单篇日志.
Returns true if the value in $post_type is a valid registered post type. This should not be confused with testing to see if a given post is of a particular post type. Note: this conditional tag became available with Version 3.0.
Returns true if book is a registered post type.
Returns true if this $post_type has been set with hierarchical support when registered. Note: This ability was added at Version 3.0.
Returns true if the book post type was registered as having support for hierarchical.
判断是否标题为"About Me And Joe" 的页面.
判断是否为 ID 42, 或别名 "about-me", 或标题 "About Me And Joe" 的页面.
判断是否ID为 9, 或者别名为 "blue-cheese", 或者名称为 "Stinky Cheeses"的分类归档页.
判断当前文章的分类ID是否为 1, 2, 或 3.
判断当前文章的分类ID是否不是 4, 5, 或 6 .
判断别名是否为 "sharp", "mild", 或 "extreme" 的标签归档页.
当前分类法归档别名为数组中的任一个"sharp", "mild", 或 "extreme"时，is_tax(array('sharp','mild','extreme')) 返回TRUE.
判断是否为 ID 4, 或者昵称 "john-jones", 或昵称 "Vivian" 的作者标签页.
When a monthly archive is being displayed.
True when viewing a post of the post type book. Introduced with Version 3.0.
True when viewing a post of the post type newspaper or book. Introduced with Version 3.0.