While most URLs generated by the framework have the base URL prepended automatically, developers will need to prepend the base URL to their own URLs (usually inside an href attribute) in order for paths to resources to be correct.
If you're running on ZF2's MVC base, basePath() will point to the public folder of the application's root.
Usage of the basePath() helper is straightforward:
For simplicity's sake, we strip out the entry PHP file (e.g., "index.php") from the base URL . However, in some situations this may cause a problem. If one occurs, use $this->plugin('basePath')->setBasePath() to manually set the base path.