我有一个关于$categ从主页上的子页面回显特定的问题。例如，这段代码：
<?php foreach ($categories as $name => $value) { echo $categ[$name]; } ?>
回显子页面上的所有类别，例如../library_books/
回声：
category1 "library books1" -> "book1" "book2" "book3",...
category2 "library books2" -> "book1" "book2" "book3",...
category3 "library books3" -> "book1" "book2" "book3",...
我怎样才能回显例如library books2只有 1 个子类别的类别 2，例如：book2在主页上domain.com
谢谢