... Even in bare-initial testing, it became obvious that the various load-balanced computers were "trashing" one-another's version of "the current session state."
Okay, sure, sure ... I can
Google DuckDuckGo™ a great-plenty web pages such as
this one, but ...
let's face it ... "that particular web-page was written seven years ago, and I don't have time to waste."
So ... what's the currently-best strategy
now??
(Yes, "the application in question" is PHP.
("PHP god-knows how-old.") Being dragged, fairly kicking-and-screaming, into the present status-quo.)
(Hyperlinks
welcome requested.)