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I get this message on my site when I first open it fresh each day. It happens both on the front end or the Fuel dashboard and only occurs on the first page load. It disappears for the rest of the day after that.
A PHP Error was encountered
Message: implode(): Passing glue string after array is deprecated. Swap the parameters
Line Number: 0
You'd think it would be just an easy task of searching for "implode" in the code and fixing it? It seems not. I've searched using text search tools from the root of the project directory and can find no offending code.
It's obviously related to sessions or cookies due to it only happening on a fresh load. It's also somewhere in the core code since there's no filename or line number reported.
It's also obviously a Fuel/CI thing since it presents in the usual CI format.
This does not happen on older versions of PHP - my publicly hosted version of the same site is on PHP7.2 with no problems.
Any ideas anyone?