php - website hostname and docroot -

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is there way in php hostname , document root server? i'd without storing them variables in php code. reluctant use $_server because have heard not reliable , subject attack. how can done on virtual host? reliable , safe method exist?

$_server['document_root'] reliable $_server['server_name'] isn’t (see chris shiflett’s server_name versus http_host). if apache’s usecanonicalname enabled canonical name shown.


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