Parse the method in php for obtaining system information

$root = getenv (' DOCUMENT_ROOT '); //// server document root directory
$port = getenv (' SERVER_PORT '); //// server port
$file = getenv (' SCRIPT_NAME '); //// currently executing file
$ua = getenv (' HTTP_USER_AGENT '); / / / / the user UA
$method = getenv (' REQUEST_METHOD '); //// request method
$protocol = getenv (' SERVER_PROTOCOL '); //// Transport protocol
getmypid(), //// returns the process number ID for the current PHP process, which does not require input parameters.
get_current_user(), //// returns the owner name of the current program, and this function does not require input parameters.

 Get system type and version number:     php_uname()           ( Ex. : Windows NT COMPUTER 5.1 build 2600)
 Get only the system type:           php_uname('s')        ( Or: PHP_OS Example: Windows NT)
 Get the system version number only:         php_uname('r')        ( Ex. : 5.1)
 To obtain PHP Operation mode:          php_sapi_name()       (PHP run mode : apache2handler)
 Get the previous process user name:         Get_Current_User()
 To obtain PHP Version:              PHP_VERSION
 To obtain Zend Version:             Zend_Version()
 To obtain PHP Installation path:          DEFAULT_INCLUDE_PATH
 Get the absolute path of the current file:     __FILE__
 To obtain Http In the request Host Value:     $_SERVER["HTTP_HOST"]                  ( The return value is domain name or IP)
 Get server IP :             GetHostByName($_SERVER['SERVER_NAME'])
 The server that accepts the request IP :       $_SERVER["SERVER_ADDR"]                ( Sometimes it is not available, it is recommended to use: GetHostByName($_SERVER['SERVER_NAME']))
 Get client IP :             $_SERVER['REMOTE_ADDR']
 Get server interpretation engine:       $_SERVER['SERVER_SOFTWARE']
 Get server CPU Quantity:        $_SERVER['PROCESSOR_IDENTIFIER']
 Get the server system directory:       $_SERVER['SystemRoot']
 Get server domain name:           $_SERVER['SERVER_NAME']                 ( Recommended use: $_SERVER["HTTP_HOST"])
 Obtain user domain name:             $_SERVER['USERDOMAIN']
 Get server language:           $_SERVER['HTTP_ACCEPT_LANGUAGE']
 Get server Web Port:        $_SERVER['SERVER_PORT']