PHP update and C5 Upgrade - Resolved

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Original issue: I can't get into the site (since it's broken), and it's a critical part of my client's business.

Resolved: See Concrete Owl's response below (Best Answer)

bionictangerine
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ConcreteOwl replied on at Permalink Best Answer Reply
ConcreteOwl
The only successful method I have used is to grab copies of the database and files and load them to my local server, setup the server to run on php 5.6.40 and upgrade the core files to run on php7+.
Then when all upgrading, debugging and optimisations are completed, run the server up on php7.4 to test, if all okay load the upgraded and updated files and database back to the live server, replacing the old files and database with the new ones.
mhawke replied on at Permalink Reply
mhawke
Do you have a set of core files that are compatible with PHP above 7.1?
bionictangerine replied on at Permalink Reply
bionictangerine
No, I don't. So, ConcreteOwl's approach probably makes the most sense for me. He's looking at it now. But thanks for asking - I really appreciate it.
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
All upgraded now to 8.5.5 and running on PHP 7.4.16, I have sent you a PM.
mhawke replied on at Permalink Reply
mhawke
Sorry, maybe I'm confused. ConcreteOwl, did you update a legacy site to c5 v 8.5.5 ?
ConcreteOwl replied on at Permalink Reply
ConcreteOwl
It was originally running on concrete 5.7.4.2, it wasn't a 5.6 site
mhawke replied on at Permalink Reply
mhawke
Oh, that explains it. I thought you were a miracle worker. LOL