It's not your problem to solve.
Not your problem to solve unless it's _your_ website.
It is a missing or broken configuration or library or package for the server's PHP install. It is a completely standard PHP error about a missing library (function) and should not show in a public website. Unfortunately, the default PHP configuration for many years has been to show these errors to the end-user, regardless of whether it's a dev environment or not. This is the reason you get so many results in Google; the vast majority of results will have nothing to do with the underlying problem.
Wade.
It is a missing or broken configuration or library or package for the server's PHP install. It is a completely standard PHP error about a missing library (function) and should not show in a public website. Unfortunately, the default PHP configuration for many years has been to show these errors to the end-user, regardless of whether it's a dev environment or not. This is the reason you get so many results in Google; the vast majority of results will have nothing to do with the underlying problem.
Wade.
