PHP server Variable $_server

PHP $_server variables

$_server is an array that contains such things as header information (header), path, and script location (scripts locations). It is a super global variable in PHP, and we can access it directly from anywhere in the PHP program.

$_server contains a lot of information, you can try to print it directly:

Print_r ($_server);

is limited to space, the results of printing are no longer listed here, and the results printed on different servers are also varied.

$_server array elements

In more cases, we only need to $_server some elements in the array (array cells). The $_server array contains the following elements:

Page Program Related

• $_server[' php_self ': relative to the root directory of the Web site and the PHP program name, and document root related.
• $_server[' Http_referer ': The URL address of the previous page linked to the current page.
• $_server[' script_name ': The path to the root directory of the Web site and the PHP program file name.
• $_server[' Request_uri ']: the URI required to access this page.
• $_server[' script_filename ': the absolute path and file name of the currently running PHP program.
• $_server[' path_translated ': The basic path of the file system (not the document root) where the current PHP program resides.
• $_server[' query_string ': query string (the first question mark in the URL?) Content that follows but does not include the following #).
• $_server[' argv ': parameters passed to the current PHP program.
• $_server[' argc ': in command-line mode, contains the number of command-line arguments passed to the program.
• $_server[' request_time ': Timestamp at the start of the request, valid from PHP 5.1.0.
• $_server[' Request_method ': The method of requesting access to a page, for example:, POST or PUT.
• $_server[' http_accept ': The current request's ACCEPT: The contents of the header information.
• $_server[' Http_accept_charset ': The Accept-charset of the current request: the contents of the header information. For example: "Iso-8859-1,*,utf-8".
• $_server[' http_accept_encoding ': The accept-encoding of the current request: the contents of the header information. For example: "gzip".
• $_server[' http_accept_language ': The accept-language of the current request: the contents of the header information. For example: "ZH-CN".
• $_server[' http_connection ': The CONNECTION of the current request: the contents of the header information. For example: "Keep-alive".
• $_server[' http_host ': The current requested HOST: The contents of the header information.
• $_server[' HTTPS ']: If the PHP program is accessed through the HTTPS protocol, it is set to a non-null value.
• $_server[' php_auth_digest ': When running as an Apache module, this variable is set to the "Authorization" HTTP header content sent by the client (for further authentication operations) during HTTP DIGEST authentication.
• $_server[' php_auth_user ': When PHP is running in Apache or IIS (PHP 5 is an ISAPI) module, and HTTP authentication is being used, this variable is the user name entered by the user.
• $_server[' PHP_AUTH_PW ': When PHP is running in Apache or IIS (PHP 5 is an ISAPI) module, and HTTP authentication is being used, this variable is the password entered by the user.
• $_server[' Auth_type ': When PHP is running in the Apache module mode and is using HTTP authentication, this variable is the type of authentication.

Server-Side related

• $_server[' Document_root ': The document root directory where the PHP program is currently running, as defined in the server configuration file.
• $_server[' Gateway_interface ': The version of the CGI specification used by the server, for example: "cgi/1.1".
• $_server[' server_addr ': The IP address of the server where the PHP program is currently running.
• $_server[' server_name ': The name of the server on which the PHP program is currently running.
• $_server[' Server_admin ']:apache the server_admin parameter in the server configuration file.
• $_server[' Server_port ': The port used by the server. If SSL secured connection is used, this value is the HTTP port set by the user.
• $_server[' server_signature ': A string containing the server version and the virtual host name.
• $_server[' Server_software ': The server-identified string, given in the header information in response to the request.
• $_server[' Server_protocol ': The name and version of the communication protocol when the page is requested, for example: "http/1.0".

Other miscellaneous

• $_server[' http_user_agent ': The user-agent of the current request: the contents of the header information that indicates the user agent who accessed the page.
• $_server[' REMOTE_ADDR ': Browsing the current page user's IP address.
• $_server[' Remote_host ': Browsing the host name of the current page user.
• $_server[' Remote_port ': The port used by the user when connecting to the server.

Note that if you run PHP as a command line, the elements listed above are almost no valid (or meaningless).

PHP server Variable $_server