WordPress中is_single()与is_singular()的区别详解
简单的认为is_sigular()相当于is_single()||is_page()||is_attachment()没有什么大问题。
也就是说，有is_single()||is_page()
1 | < ?php if ( is_single()||is_page() ) { ?> |
的地方,都可以替换成is_singular()
1 | < ?php if ( is_singular() ) { ?> |
但是其实上述这种理解不是太准确。来比较一下is_single()与is_sigular()的文档。
is_single()是可以加参数的。参数可以是post_id，post_slug，post_title。2.5之后还可以同时对这几个参数加以判断。
当不带参数时，返回的是当前显示的是不是一个单独的post（而且类型不是page和attachment）。
而带了参数，返回的就是当前显示的是不是编号/标题/标志为“XXX”的那篇post。
在数据库里，is_single不仅要查询ID是否存在，还要保证type是“post”而不是“page”，“attachment”甚至“revision”。
is_sigular()则简单的多。就是当前显示的是不是一条单独的post所形成的页面。
在数据库里，is_sigular()也只是判断ID是否存在即可。
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