We got a call from a client claiming that they couldn’t create a new blog post. I logged in to their site to test it out, and had no trouble using the site with one computer but got the same error as the client with another computer.
The error was about PHP Memory limit, but I’ve seen this error before. In my experience it’s usually caused by something other than the actual PHP Memory limit.
That same day, I had done Hoshu updates, so I suspected the problem might be coming from the new code introduced by the updates. That suspicion was correct. The Site Health section reported an old version of WordPress.
Updating to the newest version of WordPress available on the client’s server fixed the problem immediately! The old PHP engine couldn’t figure out how to use the new code. Fortunately this problem only affected the backend admin system, not the front side website.
