Description:
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Steps to reproduce:

1. go to https://www.php.net/
2. In the Search box on the top-right of the page, start typing the name of a function you know to exist, e.g. "microtime"

Expected result:
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A list of autocomplete suggestions should appear below the box as a dropdown, based on functions  that actually exist (actually this should include other stuff besides functions, but that never worked; it used to work for functions though) whose name start with what you have typed

Actual result:
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This used to work, but it no longer does.

Actually I see this error in the javascript console that pretty much looks like it could be the cause of this exact issue:

Access to XMLHttpRequest at 'https://php.net/js/search-index.php?lang=en' from origin 'https://www.php.net' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: Redirect is not allowed for a preflight request.

That's quite pathetic.