PHP: let a file return its own directory

问题

I am having trouble finding the rigth directory on my online server. is there a function that returns the folder the file is stored in?

回答1:

In PHP>=5.3 use __DIR__ and before use dirname(__FILE__)

http://php.net/constants.predefined

http://php.net/dirname

回答2:

Use the magic constant __DIR__

You can read more about the magic constants here: http://php.net/manual/en/language.constants.predefined.php

回答3:

http://php.net/manual/en/function.getcwd.php

Returns the current working directory on success, or FALSE on failure.

回答4:

The dirname() function will return the directory portion of a path. For example, dirname('foo/bar/baz.php') will return foo/bar.

This is often used in conjunction with the __FILE__ magic constant for versions of PHP that do not support the __DIR__ magic constant (versions 5.2.x and below):

require_once dirname(__FILE__) . '/../classes/Class.php';

来源：https://stackoverflow.com/questions/5794362/php-let-a-file-return-its-own-directory