Clarification for include/require relative to calling script

Question

Documentation states:

Files are included based on the file path given or, if none is given, the include_path specified. If the file isn't found in the include_path, include() will finally check in the calling script's own directory and the current working directory before failing. The include() construct will emit a warning if it cannot find a file; this is different behavior from require(), which will emit a fatal error.

I'm a little confused by the part of the sentence:

finally check in the calling script's own directory

Example of a tree structure:

• index.php

• libs

  • encryption.php

  • AES.php

My code:

index.php includes libs/encryption.php.

In encryption.php is:

require 'AES.php'; // <-- should this command end with an error?

From what documentation says I would say it should not end with an error but the commands fails in reality.

What is the proper behaviour then?

Thanks!

Answer 1

"The script" in this case refers to the execution script rather than the included module.