Using the ABSPATH constant - What files need to be loaded before use?

Question

I need to make use of the ABSPATH constant but need to know what WP files I need to include so I can make use of it.

Thanks a lot!

Answer 1

It is defined at the very start of wp-load.php.

However it's value is very primitive - only a path to where file is located, which you could easily get without bothering with including it.