| Built-in Variable
| Description
|
| ALL_HTTP | All raw headers in HTTP format |
| ALL_RAW | All raw headers (IIS *) |
| CONTENT_LENGTH | Header: Content-length |
| CONTENT_TYPE | Header: Content-type |
| DOCUMENT_ROOT | Server path to HTML document root |
| GATEWAY_INTERFACE | Current CGI version |
| HTTP_ACCEPT | Header: Accept |
| HTTP_ACCEPT_ENCODING | Header: Accept-encoding |
| HTTP_ACCEPT_LANGUAGE | Header: Accept-language |
| HTTP_COOKIE | Header: Accept-cookie |
| HTTP_HOST | Header: Host |
| HTTP_REFERER | Header: Referer |
| HTTP_USER_AGENT | Header: User-agent (browser) |
| PATH_INFO | Requested URL |
| PATH_TRANSLATED | Script filename (if any) |
| QUERY_STRING | Form GET query string |
| REMOTE_ADDR | Remote IP address |
| REMOTE_USER | Basic authentication user name |
| REMOTE_PASSWORD | Basic authentication password |
| REQUEST_METHOD | HTTP request method |
| REQUEST_URI | Complete URL of requested page |
| PHP_AUTH_USER | Basic authentication user name (Apache *) |
| PHP_AUTH_PW | Basic authentication password (Apache *) |
| REQUEST_METHOD | Header: request method |
| REQUEST_URI | Requested URL |
| SCRIPT_FILENAME | Script filename (if any) |
| SCRIPT_NAME | Script filename (if any) |
| SCRIPT_URI | Complete URL of requested page |
| SCRIPT_URL | Requested URL |
| SERVER_PORT | Server listen port |
| SERVER_PROTOCOL | Server name and protocol |
| SERVER_SOFTWARE | Server name and version |
| * Certain variables are supported for compatibility with other servers |
