using install.php gives
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PHP Warning: Undefined array key ‘HTTP_HOST’ in /home/container/wp-includes/functions.php on line 5530
I don’t have a site with WordPress.com yet
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Hey there, it sounds like your WordPress installation may be hosted elsewhere, as we don’t see this error on our services, but I was able to find this:
https://wordpress.org/support/topic/php-warning-undefined-array-key-http_host/It looks like some people had this error a few months ago and fixed it since then. Can you check to be sure your version is current? If that doesn’t work, I’d recommend checking with your host, especially if this issue just started on an installation that was previously doing fine.
Also, going forward, here’s the difference between the free WordPress software and our managed hosting services:
https://wordpress.com/support/com-vs-org/So for your own copy of WordPress, I’d recommend using the forums and resources at WordPress.org instead:
https://wordpress.org/support/forums/
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