问题 My directory structure looks like this: blog -> admin -> index.php blog.php db.php functions.php I have been trying to include ( require , really) blog.php in the admin/index.php , but facing lots of errors. I'm following a PHP course, and the instructor does the same thing successfully. admin/index.php: require "../blog.php"; which, in turn, requires two more files in its directory. require "db.php"; require "functions.php"; 回答1: If you find that relative include paths aren't working as