What to do if php require_once error occurs

php require_once reports an error because this function will put all the code in the CategoryDao.class.php file into login.php. The solution is to re-call the path of the file of the require_once function.

The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer

What should I do if the php require_once error is reported? php require_once The correct path cannot be found in ()

First describe the problem, I am using the require_once() function At that time, I thought that there was no problem with the path configuration, but the web page still showed an error that the path could not be found. The specific situation is as follows:
My project path is as follows:


In the login.php file, I called require_once(“./mysql/CategoryDAO.class.php "); to include the CategoryDao.class.php file, and call require_once("./DbConnect.class.php"); in the CategoryDao.class.php file to include the DbConnect.class.php file. As a result, the browser Target file not found.
This is because the require_once() function in login.php will put all the code in the CategoryDao.class.php file into login.php, that is, the login.php file contains the code in the CategoryDao.class.php file. All codes, including require_once("./DbConnect.class.php");, however, the current directory is the path of login.php, so the path "./DbConnect.class.php" cannot be found, and the correct path should be ". /mysql/DBConnect.class.php".
Summary, when using require_once ("relative path"), the current path is the path of the last file that called the require_once function.

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