How does PHP obtain system information and server details?

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Obtain the system type and version: php_uname () (for example, Windows nt computer 5.1 build 2600). only obtain the system type: php_uname ('s') (or PHP_ OS, for example, Windows NT) only get the system version: php_uname ('r') (example: 5.1) get the PHP running mode: php_sapi_name () (PHP run mode: apache2handler) get the previous process username: Get_Current_User () get PHP version: PHP_VERSION get Zend version: Zend_Version () get PHP Installation Path: DEFAULT_INCLUDE_PATH get the absolute path of the current FILE: _ FILE __

Obtain the Host value in an Http request: $ _ SERVER ["HTTP_HOST"] (the returned value is a domain name or IP address)
Get server ip: GetHostByName ($ _ SERVER ['server _ name'])
IP address of the SERVER that receives the request: $ _ SERVER ["SERVER_ADDR"] (sometimes it cannot be obtained. recommended: GetHostByName ($ _ SERVER ['server _ name'])
Obtain the client IP address: $ _ SERVER ['remote _ ADDR ']
Obtain SERVER interpretation engine: $ _ SERVER ['server _ soft']
Obtain the number of SERVER CPUs: $ _ SERVER ['processor _ IDENTIFIER ']
Get the SERVER system directory: $ _ SERVER ['systemroot']
Get SERVER domain NAME: $ _ SERVER ['server _ name'] (recommended: $ _ SERVER ["HTTP_HOST"])
Get user domain name: $ _ SERVER ['userdomain ']
Obtain the SERVER language: $ _ SERVER ['http _ ACCEPT_LANGUAGE ']
Obtain the SERVER Web PORT: $ _ SERVER ['server _ port']