Abstraction method which returns System Environment Variables regardless of server OS, CGI/MODULE version etc. Basically this is SERVER variables for most of them.
This should be used instead of getEnv() and HTTP_SERVER_VARS/ENV_VARS to get reliable values for all situations.
Usage: 226
param: string Name of the "environment variable"/"server variable" you wish to use. Valid values are SCRIPT_NAME, SCRIPT_FILENAME, REQUEST_URI, PATH_INFO, REMOTE_ADDR, REMOTE_HOST, HTTP_REFERER, HTTP_HOST, HTTP_USER_AGENT, HTTP_ACCEPT_LANGUAGE, QUERY_STRING, TYPO3_DOCUMENT_ROOT, TYPO3_HOST_ONLY, TYPO3_HOST_ONLY, TYPO3_REQUEST_HOST, TYPO3_REQUEST_URL, TYPO3_REQUEST_SCRIPT, TYPO3_REQUEST_DIR, TYPO3_SITE_URL, _ARRAY
return: string Value based on the input key, independent of server/os environment.
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