Server Information
The $_SERVER
array contains
a lot of useful information from the web server. Much of this information
comes from the environment variables required in the CGI specification.
Here is a complete list of the entries in $_SERVER
that come from CGI:
PHP_SELF
The name of the current script, relative to the document root (e.g., /store/cart.php). You should already have noted seeing this used in some of the sample code in earlier chapters. This variable is useful when creating self-referencing scripts, as we’ll see later.
SERVER_SOFTWARE
A string that identifies the server (e.g., “Apache/1.3.33 (Unix) mod_perl/1.26 PHP/5.0.4”).
SERVER_NAME
The hostname, DNS alias, or IP address for self-referencing URLs (e.g., www.example.com).
GATEWAY_INTERFACE
The version of the CGI standard being followed (e.g., “CGI/1.1”).
SERVER_PROTOCOL
The name and revision of the request protocol (e.g., “HTTP/1.1”).
SERVER_PORT
The server port number to which the request was sent (e.g., “80”).
REQUEST_METHOD
The method the client used to fetch the document (e.g., “GET”).
PATH_INFO
Extra path elements given by the client (e.g., /list/users).
PATH_TRANSLATED
The value of
PATH_INFO
, translated by the server into a filename (e.g., /home/httpd/htdocs/list/users).SCRIPT_NAME
The URL path to the current page, which is useful for self-referencing scripts (e.g., /~me/menu.php).
QUERY_STRING
Everything after the
?
in the URL (e.g., name=Fred+age=35).REMOTE_HOST
The hostname of the machine that requested this page (e.g., “dialup-192-168-0-1.example.com ...
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