php--Super Global Variables _ Learning notes PHP application global variables PHP global static variable PHP global variable assignment

What is a Hyper global variable

Many of the predefined variables in PHP are "hyper-global", which means they are available in all scopes of a script. There is no need to perform a global $variable in a function or method; You can access them.

$_SERVER//查看服务器信息$_GET//地址栏参数$_POST//表单提交的值$_REQUEST//接受$_GET或$_POST的值$_FILES//文件上传$_COOKIE//跟踪用户状态$_SESSION//跟踪用户状态$GLOBALS//获取所有全局变量的值

$_server:
You can view information about the server, which holds information about the header, path, and location of the script.
Print it out below to see:

    
     print_r($_SERVER);?>

The results are as follows:

Array ([Http_host]=localhost [http_connection]=keep-alive [Http_cache_control]=Max-age=0[Http_accept]=Text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8[Http_upgrade_insecure_requests]=1[Http_user_agent]=mozilla/5.0(Windows NT6.1; WOW64) applewebkit/537.36(khtml, like Gecko) chrome/48.0. 2564. theubrowser/5.6. 11466. 7safari/537.36[Http_referer]=http://localhost/php/php7/[Http_accept_encoding]=gzip, deflate [http_accept_language]=zh-cn,zh;q=0.8[PATH]=C: \Windows\System32;C: \ windows;C: \windows\system32\wbem;C: \windows\system32\windowspowershell\v1. 0\; [SystemRoot]=C: \ Windows [COMSPEC]=C: \windows\system32\cmd.exe [Pathext]=. COM;. EXE;. BAT;. CMD;. VBS;. VBE;. JS;. JSE;. WSF;. WSH;. MSC [windir]=C: \ Windows [Server_signature]=apache/2.4. 9(Win64) php/5.5.Server at localhost Port the[Server_software]=apache/2.4. 9(Win64) php/5.5.[SERVER_NAME]=localhost [server_addr]=::1[Server_port]= the[REMOTE_ADDR]=::1[Document_root]=D:/www/[Request_scheme]=HTTP [Context_prefix]=[Context_document_root]=D:/www/[Server_admin]=Admin@example. com [Script_filename]=D:/www/php/php7/demo.php [Remote_port]=52683[Gateway_interface]=cgi/1.1[Server_protocol]=http/1.1[Request_method]=GET [Query_string]=[Request_uri]=/php/php7/demo.php [Script_name]=/php/php7/demo.php [Php_self]=/php/php7/demo.php [Request_time_float]=1460548562.994[Request_time]=1460548562)

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