Common functions, excel Common functions

Common functions, excel Common functions

Require () usage:

(1) If X is a built-in module, such as the format of require ('HTTP.

A. Return to this module

B. Do not continue execution
(2) If X starts with "./", "/", or.

A. Determine the absolute path of X based on the parent module of X.

B. Use X as a file and search for the following files in sequence. If one of them exists, the file will be returned and will not be executed.

C. Use X as the Directory and search for the following files in sequence. If one of them exists, the file will be returned and will not be executed.

(3) If X does not contain a path.

A. determine the possible installation directory of X based on the parent module of X.
B. Load X as a file name or directory name in each directory in sequence.

(4) throw "not found ".

_ DIR _ usage:

The magic constant that points to the directory where the PHP script is currently executed.

For example, __dir _ equals to '/www/website '.