| CONTENT_LENGTH | The number of bytes of data passed through standard input via the POST method. |
| DOCUMENT_ROOT | Path on the server to the web site (root URL) being accessed. |
| GATEWAY_INTERFACE | Protocol used to communicate with the server. |
| HTTP_COOKIE | The contents of all cookies that are visible to the script - each cookie delimited by a semicolon (';'). |
| HTTP_USER_AGENT | The name (eg. 'Mozilla') and version (eg. '4.03') of the browser used to access the server and the type of platform used by the browser (eg. 'Macintosh;I;PPC'). |
| HTTP_REFERER | The URL of the page that was being viewed when the script was accessed, either via a link or by direct entering o fthe URL. Can be used to check that the user has come from a recognised source, to help with security. |
| QUERY_STRING | Holds the data input via the GET method. |
| REQUEST_METHOD | Either "POST" or "GET", depending on what is set on the method attributes of the form tag. NB This value will be "POST" if method="POST", even if some data is passed via GET (eg. data appended directly to the action URL).
The following will cause both methods to be used, even though $REQUEST_METHOD="POST":
|
| SERVER_SOFTWARE | Name and version of the web server. |
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