Variable DescriptionDOCUMENT_ROOT Document rootHTTP_ACCEPT Accept header of an HTTP request HTTP_ACCEPT_ENCODING Accepted encoding (deflate or gzip)HTTP_ACCEPT_LANGUAGE Accept-Language from HTTP headerHTTP_CONNECTION Connection header of the HTTP requestHTTP_HOST Internet hostHTTP_USER_AGENT Client initiating web requestPATH Directories the server looks REMOTE_ADDR Address of the clientREMOTE_PORT Port of client SCRIPT_FILENAME Absolute path of scriptSERVER_ADDR Server's addressSERVER_ADMIN Admin of serverSERVER_NAME Server name setSERVER_PORT Port the web server is running onSERVER_SIGNATURE Version of the server softwareSERVER_SOFTWARE Server's identification string, found in HTTP headerGATEWAY_INTERFACE Version of the CGI spec usedSERVER_PROTOCOL Protocol server is currently usingREQUEST_METHOD Request method, such as GET, PUT, POST, etc.QUERY_STRING Query string if one existsREQUEST_URI Uniform Resource Identifier SCRIPT_NAME Path and name for the current scriptPATH_TRANSLATED Absolute path on the web server's file systemPHP_SELF Location of PHP script relative to document root
