我有一个关于在主页上从子页面回显特定$categ的问题。例如，这个代码：
<?php foreach ($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",...
我如何回应示例category2 library books2，只有1个子类别，例如：主页book2上的domain.com
由于