$_SERVER['PHP_SELF'] #The file name of the currently executing script is related to document root.
$_SERVER['argv'] #The argument passed to the script.
$_SERVER['argc'] #Contains the number of command line parameters passed to the program (if running in command line mode).
$_SERVER['GATEWAY_INTERFACE'] #The version of the CGI specification used by the server. For example, "CGI/1.1".
$_SERVER['SERVER_NAME'] #The name of the server host where the script is currently running.
$_SERVER['SERVER_SOFTWARE'] #The string identified by the server is given in the header when responding to the request.
$_SERVER['SERVER_PROTOCOL'] #The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".
$_SERVER['REQUEST_METHOD'] #Request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".
$_SERVER['QUERY_STRING'] #Query string.
$_SERVER['DOCUMENT_ROOT'] #The document root directory where the script is currently running. Define in the server configuration file.
$_SERVER['HTTP_ACCEPT'] #The current request Accept: The content of the header.
$_SERVER['HTTP_ACCEPT_CHARSET'] #The current request Accept-Charset: The content of the header. For example: "iso-8859-1,*,utf-8".
$_SERVER['HTTP_ACCEPT_ENCODING'] #The current request Accept-Encoding: The content of the header. For example: "gzip".
$_SERVER['HTTP_ACCEPT_LANGUAGE']#Accept-Language: The content of the header. For example: "en".
$_SERVER['HTTP_CONNECTION'] #Connection of the current request: The content of the header. For example: "Keep-Alive".
$_SERVER['HTTP_HOST'] #The current requested Host: The content of the header.
$_SERVER['HTTP_REFERER'] #The URL address of the previous page of the current page.
$_SERVER['HTTP_USER_AGENT'] #The current requested User_Agent: The content of the header.
$_SERVER['HTTPS'] — If accessed via https, it is set to a non-empty value (on), otherwise it returns off
$_SERVER['REMOTE_ADDR'] #The IP address of the user who is browsing the current page.
$_SERVER['REMOTE_HOST'] #The host name of the user who is browsing the current page.
$_SERVER['REMOTE_PORT'] #The port used by the user when connecting to the server.
$_SERVER['SCRIPT_FILENAME'] #The absolute path name of the currently executed script.
$_SERVER['SERVER_ADMIN'] #Admin Information
$_SERVER['SERVER_PORT'] #Port used by the server
$_SERVER['SERVER_SIGNATURE'] #Standard containing the server version and virtual host name.
$_SERVER['PATH_TRANSLATED'] #The basic path to the file system where the current script is located (not the document root directory).
$_SERVER['SCRIPT_NAME'] #Contains the path to the current script. This is very useful when the page needs to point to itself.
$_SERVER['REQUEST_URI'] #The URI required to access this page. For example,"/".
$_SERVER['PHP_AUTH_USER'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the user name entered by the user.
$_SERVER['PHP_AUTH_PW'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
$_SERVER['AUTH_TYPE'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the authentication type
$_SERVER['argv'] #The argument passed to the script.
$_SERVER['argc'] #Contains the number of command line parameters passed to the program (if running in command line mode).
$_SERVER['GATEWAY_INTERFACE'] #The version of the CGI specification used by the server. For example, "CGI/1.1".
$_SERVER['SERVER_NAME'] #The name of the server host where the script is currently running.
$_SERVER['SERVER_SOFTWARE'] #The string identified by the server is given in the header when responding to the request.
$_SERVER['SERVER_PROTOCOL'] #The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".
$_SERVER['REQUEST_METHOD'] #Request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".
$_SERVER['QUERY_STRING'] #Query string.
$_SERVER['DOCUMENT_ROOT'] #The document root directory where the script is currently running. Define in the server configuration file.
$_SERVER['HTTP_ACCEPT'] #The current request Accept: The content of the header.
$_SERVER['HTTP_ACCEPT_CHARSET'] #The current request Accept-Charset: The content of the header. For example: "iso-8859-1,*,utf-8".
$_SERVER['HTTP_ACCEPT_ENCODING'] #The current request Accept-Encoding: The content of the header. For example: "gzip".
$_SERVER['HTTP_ACCEPT_LANGUAGE']#Accept-Language: The content of the header. For example: "en".
$_SERVER['HTTP_CONNECTION'] #Connection of the current request: The content of the header. For example: "Keep-Alive".
$_SERVER['HTTP_HOST'] #The current requested Host: The content of the header.
$_SERVER['HTTP_REFERER'] #The URL address of the previous page of the current page.
$_SERVER['HTTP_USER_AGENT'] #The current requested User_Agent: The content of the header.
$_SERVER['HTTPS'] — If accessed via https, it is set to a non-empty value (on), otherwise it returns off
$_SERVER['REMOTE_ADDR'] #The IP address of the user who is browsing the current page.
$_SERVER['REMOTE_HOST'] #The host name of the user who is browsing the current page.
$_SERVER['REMOTE_PORT'] #The port used by the user when connecting to the server.
$_SERVER['SCRIPT_FILENAME'] #The absolute path name of the currently executed script.
$_SERVER['SERVER_ADMIN'] #Admin Information
$_SERVER['SERVER_PORT'] #Port used by the server
$_SERVER['SERVER_SIGNATURE'] #Standard containing the server version and virtual host name.
$_SERVER['PATH_TRANSLATED'] #The basic path to the file system where the current script is located (not the document root directory).
$_SERVER['SCRIPT_NAME'] #Contains the path to the current script. This is very useful when the page needs to point to itself.
$_SERVER['REQUEST_URI'] #The URI required to access this page. For example,"/".
$_SERVER['PHP_AUTH_USER'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the user name entered by the user.
$_SERVER['PHP_AUTH_PW'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
$_SERVER['AUTH_TYPE'] #When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the authentication type