include function on PHP

The include() statement includes and evaluates the specified file.

The documentation below also applies to require().

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.

If a path is defined — whether absolute (starting with a drive …