这两行PHP是不同的？

Question

I'm looking through a code base. This is one of the lines.

require_once( dirname(__FILE__) . '/a_script.php' );

I'm considering rewriting it as:

require_once( './a_script.php' );

Are those two lines of code any different?

Answer 1

Yes, they are different. The second one is relative to the working directory, which is not always the same thing as the directory the currently executing file is in.

For the most part, the working directory is the directory of the original file . If you are running the require_once in a file that is being included by another file, the path is relative the first file.

Answer 2

They have some different

// '/dir/index.php'
require_once( dirname(__FILE__) . '/script.php' ); // '/dir/script.php'
require_once( './script.php' ); // '/dir/script.php'

chdir('/')
require_once( dirname(__FILE__) . '/script.php' ); // '/dir/script.php'
require_once( './script.php' ); // '/script.php'