You have to use the cookie as a search key to look up the session information wherever WordPress stores it. You need the cookie, but the cookie is an opaque token rather something you meaningfully read to extract information.

Are you asking how to get the cookie in the first place? Is this system on the same domain, such that the user's browser will send the WordPress cookie?

In reply to Re^3: Grab username from WP Cookie by jcb
in thread Grab username from WP Cookie by htmanning

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