[BUGS-7678] define PANTHEON_HOSTNAME constant #381
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This PR adds a
PANTHEON_HOSTNAME
constant which defaults to$_SERVER['HTTP_HOST']
if it exists.When used to define
DOMAIN_CURRENT_SITE
on WordPress multisites (e.g.define( 'DOMAIN_CURRENT_SITE', PANTHEON_HOSTNAME )
), this solves the "undefined index HTTP_HOST" error that shows up in PHP error logs.